Q1 Blood grouping was discovered by-
रक्त ग्रुपिंग की खोज किसके द्वारा की गई थी-
(a)Louis Pasteur(लुई पास्चर)
(b)William Harvey(विलियम हार्वे)
(c)Robert Koch(रॉबर्ट कोच)
(d)Landsteiner(लैंडस्टीनर)
(a)Louis Pasteur(लुई पास्चर)
(b)William Harvey(विलियम हार्वे)
(c)Robert Koch(रॉबर्ट कोच)
(d)Landsteiner(लैंडस्टीनर)
S1. Ans.(d)
Q4. We get morhine from-
हमें मॉर्फिन _____ से मिलता है.
(a) Flower(फूल)
(b) Leave(पत्तियां)
(c) Fruit(फल)
(d) Stem(तना)
Q2. Who propounded the theory of evolution?
विकास का सिद्धांत किसने दिया?
(a) Spencer(स्पेंसर )
(b) Darwin(डार्विन)
(c) Wallace(वालेस)
(d) Huxley(हक्सले)
विकास का सिद्धांत किसने दिया?
(a) Spencer(स्पेंसर )
(b) Darwin(डार्विन)
(c) Wallace(वालेस)
(d) Huxley(हक्सले)
S2. Ans.(b)
Sol. Charles Robert Darwin was an English geologist and best known for his contribution to evolutionary theory. Darwin published his theory of evolution in his book ‘On the Origin of Species” in 1859. Darwinian theory.
Sol. Charles Robert Darwin was an English geologist and best known for his contribution to evolutionary theory. Darwin published his theory of evolution in his book ‘On the Origin of Species” in 1859. Darwinian theory.
Q3. Plants growing on rocks are called:
चट्टानों पर उगने वाले पौधे क्या कहलाते हैं?
(a) Epiphytes(एफिफाइट्स )
(b) Halophytes(हेलोफाइट्स )
(c) Xerophytes(ज़ेरोफाइट्स )
(d) Lithophytes(लिथोफाइट्स )
चट्टानों पर उगने वाले पौधे क्या कहलाते हैं?
(a) Epiphytes(एफिफाइट्स )
(b) Halophytes(हेलोफाइट्स )
(c) Xerophytes(ज़ेरोफाइट्स )
(d) Lithophytes(लिथोफाइट्स )
S3. Ans.(d)
Sol. Lithophytes are plants that grow in or on rocks. Those that grow on rocks are also known as epipetric or epilithic plants. Lithophytes feed off nutrients from rain water and nearby decaying plants, including their own dead tissue
Q4. We get morhine from-
हमें मॉर्फिन _____ से मिलता है.
(a) Flower(फूल)
(b) Leave(पत्तियां)
(c) Fruit(फल)
(d) Stem(तना)
S4. Ans.(c)
Sol. Morphine is acquired from the unripe fruits of poppy straw. Poppy plant is an angiosperm plant from which opium and heroin are also acquired. The word morphine originates from Morpheus and it is used as a painkiller medicine and sleeping pills. Morphine directly affects central nervous system.
Q5. Which compound present in D.N.A. does not form amino acid?
D.N.A. में उपस्थित कौन सा यौगिक एमिनो एसिड का निर्माण नहीं करता है?
(a) Adenine(एडीनाइन)
(b) Tyrosine(टायरोसिन )
(c) Guanine(गुआनिन)
(d) Cytosine(साइटोसिन)
Sol. Morphine is acquired from the unripe fruits of poppy straw. Poppy plant is an angiosperm plant from which opium and heroin are also acquired. The word morphine originates from Morpheus and it is used as a painkiller medicine and sleeping pills. Morphine directly affects central nervous system.
Q5. Which compound present in D.N.A. does not form amino acid?
D.N.A. में उपस्थित कौन सा यौगिक एमिनो एसिड का निर्माण नहीं करता है?
(a) Adenine(एडीनाइन)
(b) Tyrosine(टायरोसिन )
(c) Guanine(गुआनिन)
(d) Cytosine(साइटोसिन)
S5. Ans.(b)
Sol. Tyrosine or 4-hydroxphenylalanine is one of the 22 amino acids that are used by cells to synthesize proteins. Its codons are UAC and UAU. It is a non-essential amino acid with a polar side group. It was first discovered in 1846 by German chemist Justus von Liebig in the protein casein from cheese. It is called tyrosyl when referred to as a functional group or side chain.
Sol. Tyrosine or 4-hydroxphenylalanine is one of the 22 amino acids that are used by cells to synthesize proteins. Its codons are UAC and UAU. It is a non-essential amino acid with a polar side group. It was first discovered in 1846 by German chemist Justus von Liebig in the protein casein from cheese. It is called tyrosyl when referred to as a functional group or side chain.
Q6. Who delivered the principle of ‘jumping gene’?
‘जंपिंग जीन’ के सिद्धांत को किसने दिया?
(a) Gregor Johann Mendel(ग्रेगर जोहान मेंडेल)
(b) Tomas Hunt Morgan(थॉमस हंट मॉर्गन)
(c) Barbara Mc Clintock(बारबरा मक्कलिंटॉक)
(d) Watson and Crick(वाटसन और क्रिक)
‘जंपिंग जीन’ के सिद्धांत को किसने दिया?
(a) Gregor Johann Mendel(ग्रेगर जोहान मेंडेल)
(b) Tomas Hunt Morgan(थॉमस हंट मॉर्गन)
(c) Barbara Mc Clintock(बारबरा मक्कलिंटॉक)
(d) Watson and Crick(वाटसन और क्रिक)
S6. Ans.(c)
Sol. Barbara MC Clintock was the more profound of jumping genes principle. She was awarded Nobel Prize in 1983 for this special research in medical science while studying of heredity in the corn plant.
Q7. Blue-green algae is used to supply nitrogen to-
ब्लू-ग्रीन शैवाल का इस्तेमाल _______ को नाइट्रोजन की आपूर्ति करने के लिए किया जाता है
(a) Bajra(बाजरे)
(b) Maize(मक्का)
(c) Paddy(धान)
(d) Wheat(गेहूँ)
Sol. Barbara MC Clintock was the more profound of jumping genes principle. She was awarded Nobel Prize in 1983 for this special research in medical science while studying of heredity in the corn plant.
Q7. Blue-green algae is used to supply nitrogen to-
ब्लू-ग्रीन शैवाल का इस्तेमाल _______ को नाइट्रोजन की आपूर्ति करने के लिए किया जाता है
(a) Bajra(बाजरे)
(b) Maize(मक्का)
(c) Paddy(धान)
(d) Wheat(गेहूँ)
S7. Ans.(c)
Sol. Cyanobacteria or blue-green algae is an example of a biofertilizer, a type of organic fertilizer which contains living organisms naturally occurring inputs like solar energy, nitrogen, and water to ensure soil fertility and plant growth. Blue-green algae are mainly used as biofertilizer in the crop paddy
Q8. How many bones are there in human skeleton?
मानव कंकाल में कितनी हड्डियां हैं?
(a) 280
(b) 200
(c) 220
(d) 206
Sol. Cyanobacteria or blue-green algae is an example of a biofertilizer, a type of organic fertilizer which contains living organisms naturally occurring inputs like solar energy, nitrogen, and water to ensure soil fertility and plant growth. Blue-green algae are mainly used as biofertilizer in the crop paddy
Q8. How many bones are there in human skeleton?
मानव कंकाल में कितनी हड्डियां हैं?
(a) 280
(b) 200
(c) 220
(d) 206
S8. Ans.(d)
Sol. The skeleton of an adult human body consists of 206 bones. It is composed of 213 bones in a child, which decreases to 206 bones by adulthood after some bones have fused together. Together these bones form the axial skeleton and the appendicular skeleton.
Sol. The skeleton of an adult human body consists of 206 bones. It is composed of 213 bones in a child, which decreases to 206 bones by adulthood after some bones have fused together. Together these bones form the axial skeleton and the appendicular skeleton.
Q9. An antigen is a substance which-
एक प्रतिजन एक पदार्थ है जो-
(a) Lowers body temperatures(शरीर के तापमान को कम करता है)
(b) Destroys harmful bacteria(हानिकारक बैक्टीरिया को नष्ट कर देता है)
(c) Triggers the immune system(प्रतिरक्षा प्रणाली को ट्रिगर करता है)
(d) Is used as an antidote to poison (विष के लिए एक विषाक्त पदार्थ के रूप में प्रयोग किया जाता है)
एक प्रतिजन एक पदार्थ है जो-
(a) Lowers body temperatures(शरीर के तापमान को कम करता है)
(b) Destroys harmful bacteria(हानिकारक बैक्टीरिया को नष्ट कर देता है)
(c) Triggers the immune system(प्रतिरक्षा प्रणाली को ट्रिगर करता है)
(d) Is used as an antidote to poison (विष के लिए एक विषाक्त पदार्थ के रूप में प्रयोग किया जाता है)
S9. Ans.(c)
Sol. An antibody is a molecule produced by animals in response to antigen and has the particular property of combining specifically with the antigen which induced its formation. It is blood protein (globulin) which may make an infected animal immune to a foreign antigen. This response is called the immune response.
Q10. Light energy changes into the chemical energy by which of the following process
लाइट ऊर्जा को रासायनिक ऊर्जा में निम्न में से किस प्रक्रिया द्वारा बदला जाता है?
(a) Electrolysis(इलेक्ट्रोलीज़)
(b) By photosynthesis(प्रकाश संश्लेषण द्वारा)
(c) By respiration(श्वसन द्वारा)
(d) By spewing(उगलने द्वारा)
Sol. An antibody is a molecule produced by animals in response to antigen and has the particular property of combining specifically with the antigen which induced its formation. It is blood protein (globulin) which may make an infected animal immune to a foreign antigen. This response is called the immune response.
Q10. Light energy changes into the chemical energy by which of the following process
लाइट ऊर्जा को रासायनिक ऊर्जा में निम्न में से किस प्रक्रिया द्वारा बदला जाता है?
(a) Electrolysis(इलेक्ट्रोलीज़)
(b) By photosynthesis(प्रकाश संश्लेषण द्वारा)
(c) By respiration(श्वसन द्वारा)
(d) By spewing(उगलने द्वारा)
S10. Ans.(b)
Sol. In the process of photosynthesis, light energy changes into the chemical energy. Normally plants utilize sunlight but marine algae also use moonlight, photosynthesis even occurs in electric light.
Q11. Match List-I with List-II and select the correct answer using the codes given below the lists:
सूची I का सूची II के साथ मिलान कीजिये और दिए गए कोड का प्रयोग करते हुए सही उत्तर का चयन कीजिये:
List-I List-II
(सूची-I)(सूची-II)
A. Ptyalin(ट्यालिन ) 1. Converts angiotensinogen in blood into angiotensin (एंजियोटेसिनोज़ रक्त को एंजियोटेनसिन में परिवर्तित करता है)
B. Pepsin(पेप्सिन) 2. Digests starch (डाइजेस्ट स्टार्च)
C. Renin(रेनिन) 3. Digests proteins (डाइजेस्ट प्रोटीन)
D. Oxytocin(ऑक्सीटोसिन) 4. Hydrolyses fats(हाइड्रोलाइसेस वसा)
5. Induces contraction of smooth muscles (चिकनी मांसपेशियों के संकुचन को प्रवृत करता है)
Code: (कूट: )
A B C D
(a) 2 3 1 5
(b) 3 4 2 5
(c) 2 3 5 1
(d) 3 1 2 4
S11. Ans.(a)
Sol. Ptyalin – An enzyme in the saliva that converts starch into dextrin and maltose.
Pepsin – An enzyme that splits proteins into proteoses and peptones.
Renin – A proteolytic enzyme secreted by the kidneys that convert angiotensin
Oxytocin – A polypeptide hormone, produced by the posterior lobe of the pituitary gland that stimulates contraction of the smooth muscle of the uterus.
Q12. Casein is milk :
कैसिइन दूध ______ है:
(a) Bacterium(जीवाणु)
(b) Sugar(शुगर)
(c) Protein(प्रोटीन)
(d) Fat(वसा)
Sol. In the process of photosynthesis, light energy changes into the chemical energy. Normally plants utilize sunlight but marine algae also use moonlight, photosynthesis even occurs in electric light.
Q11. Match List-I with List-II and select the correct answer using the codes given below the lists:
सूची I का सूची II के साथ मिलान कीजिये और दिए गए कोड का प्रयोग करते हुए सही उत्तर का चयन कीजिये:
List-I List-II
(सूची-I)(सूची-II)
A. Ptyalin(ट्यालिन ) 1. Converts angiotensinogen in blood into angiotensin (एंजियोटेसिनोज़ रक्त को एंजियोटेनसिन में परिवर्तित करता है)
B. Pepsin(पेप्सिन) 2. Digests starch (डाइजेस्ट स्टार्च)
C. Renin(रेनिन) 3. Digests proteins (डाइजेस्ट प्रोटीन)
D. Oxytocin(ऑक्सीटोसिन) 4. Hydrolyses fats(हाइड्रोलाइसेस वसा)
5. Induces contraction of smooth muscles (चिकनी मांसपेशियों के संकुचन को प्रवृत करता है)
Code: (कूट: )
A B C D
(a) 2 3 1 5
(b) 3 4 2 5
(c) 2 3 5 1
(d) 3 1 2 4
S11. Ans.(a)
Sol. Ptyalin – An enzyme in the saliva that converts starch into dextrin and maltose.
Pepsin – An enzyme that splits proteins into proteoses and peptones.
Renin – A proteolytic enzyme secreted by the kidneys that convert angiotensin
Oxytocin – A polypeptide hormone, produced by the posterior lobe of the pituitary gland that stimulates contraction of the smooth muscle of the uterus.
Q12. Casein is milk :
कैसिइन दूध ______ है:
(a) Bacterium(जीवाणु)
(b) Sugar(शुगर)
(c) Protein(प्रोटीन)
(d) Fat(वसा)
S12. Ans.(c)
Sol. Casein is a phosphoprotein, which is found in milk. Phosphoprotein means any protein containing bound phosphate. The white colour of the milk is also due to the presence of casein. Some of the other proteins like lactoglobulin and lactalbumin are also found in milk. It is notable that milk is a complete diet, which contains approx.. 3.3% protein.
Q13. BMD test is held for diagnosis of-
BMD टेस्ट _____ के रोगनिर्णय के लिए किया जाता है –
(a) Dengue(डेंगू)
(b) Malaria(मलेरिया)
(c) Osteoporosis(ऑस्टियोपोरोसिस)
(d) AIDS(एड्स)
Sol. Casein is a phosphoprotein, which is found in milk. Phosphoprotein means any protein containing bound phosphate. The white colour of the milk is also due to the presence of casein. Some of the other proteins like lactoglobulin and lactalbumin are also found in milk. It is notable that milk is a complete diet, which contains approx.. 3.3% protein.
Q13. BMD test is held for diagnosis of-
BMD टेस्ट _____ के रोगनिर्णय के लिए किया जाता है –
(a) Dengue(डेंगू)
(b) Malaria(मलेरिया)
(c) Osteoporosis(ऑस्टियोपोरोसिस)
(d) AIDS(एड्स)
S13. Ans.(c)
Sol. BMD test is used for the diagnosis of osteoporosis. It is a disease of bones in which the chances of fracture increases. In this disease, the bone mineral density decreases and bone microstructure is destroyed.
Sol. BMD test is used for the diagnosis of osteoporosis. It is a disease of bones in which the chances of fracture increases. In this disease, the bone mineral density decreases and bone microstructure is destroyed.
Q14. Cobalt-60 is commonly used in radiation therapy because it emits-
कोबाल्ट -60 सामान्यतः विकिरण चिकित्सा में प्रयोग किया जाता है क्योंकि यह _______ का उत्सर्जन करता है-
(a) Alfa rays(अल्फा किरणें)
(b) Beta rays(बीटा किरणें)
(c) Gamma rays(गामा किरणें)
(d) X-rays(एक्स-रे)
कोबाल्ट -60 सामान्यतः विकिरण चिकित्सा में प्रयोग किया जाता है क्योंकि यह _______ का उत्सर्जन करता है-
(a) Alfa rays(अल्फा किरणें)
(b) Beta rays(बीटा किरणें)
(c) Gamma rays(गामा किरणें)
(d) X-rays(एक्स-रे)
S14. Ans.(c)
Sol. Cobalt-60, radio isotope of cobalt which emits gamma rays, is used in the treatment of cancer
Q15. The liver disease Hepatitis-B is caused by-
यकृत रोग हेपेटाइटिस-बी का कारण होता है-
(a) DNA Virus(डीएनए वायरस)
(b) RNA Virus(आरएनए वायरस)
(c) Bacterium(जीवाणु)
(d) Platyhelminth(प्लेटीहेलमिनट)
Sol. Cobalt-60, radio isotope of cobalt which emits gamma rays, is used in the treatment of cancer
Q15. The liver disease Hepatitis-B is caused by-
यकृत रोग हेपेटाइटिस-बी का कारण होता है-
(a) DNA Virus(डीएनए वायरस)
(b) RNA Virus(आरएनए वायरस)
(c) Bacterium(जीवाणु)
(d) Platyhelminth(प्लेटीहेलमिनट)
S15. Ans.(a)
Sol. Hepatitis-B virus is a DNA virus. It causes scarring of the liver, liver failure, liver cancer and even death.
Sol. Hepatitis-B virus is a DNA virus. It causes scarring of the liver, liver failure, liver cancer and even death.
एक पेंडुलम की अवधि किस पर निर्भर करती है-
(a) the mass/द्रव्यमान पर
(b) the length/लंबाई पर
(c) the time/समय पर
(d) both (a) and (b)/ दोनों (a) और (b)
(a) the mass/द्रव्यमान पर
(b) the length/लंबाई पर
(c) the time/समय पर
(d) both (a) and (b)/ दोनों (a) और (b)
S16. Ans.(b)
Sol. Time period T = 2π √(l/g). The time period of a pendulum depends on its length l and acceleration due to gravity g.
Sol. Time period T = 2π √(l/g). The time period of a pendulum depends on its length l and acceleration due to gravity g.
Q17. Which of the following is the smallest unit of length?
निम्नलिखित में से लंबाई की सबसे छोटी इकाई क्या है?
(a) Micrometre/ माइक्रोमीटर
(b) Nanometre / नैनोमीटर
(c) Angstrom / ऐंग्स्ट्रॉम
(d) Fermimetre /फर्मीमीटर
निम्नलिखित में से लंबाई की सबसे छोटी इकाई क्या है?
(a) Micrometre/ माइक्रोमीटर
(b) Nanometre / नैनोमीटर
(c) Angstrom / ऐंग्स्ट्रॉम
(d) Fermimetre /फर्मीमीटर
S17. Ans.(d)
Sol. 1 micron = 10⁻⁶ m
1 nanometer = 10⁻⁹ m
1 angstrom = 10⁻¹⁰ m
1 fermi = 10⁻¹⁵ m
Sol. 1 micron = 10⁻⁶ m
1 nanometer = 10⁻⁹ m
1 angstrom = 10⁻¹⁰ m
1 fermi = 10⁻¹⁵ m
Q18. A man is standing on a boat in still water. If he walks towards the shore, the boat will
एक व्यक्ति स्थिर पानी में एक नाव पर खड़ा है. यदि वह किनारे की तरफ चलता है, तो नाव-
(a) move towards the shore/ किनारे की ओर बढ़ेंगी
(b) move away from the shore/ किनारे से दूर जाएगी
(c) remain stationary/ स्थिर रहेगी
(d) sink/डूब जाएगी
एक व्यक्ति स्थिर पानी में एक नाव पर खड़ा है. यदि वह किनारे की तरफ चलता है, तो नाव-
(a) move towards the shore/ किनारे की ओर बढ़ेंगी
(b) move away from the shore/ किनारे से दूर जाएगी
(c) remain stationary/ स्थिर रहेगी
(d) sink/डूब जाएगी
S18. Ans.(b)
Sol. According to Newton’s third law of motion, every action has an equal and opposite reaction. This implies that force always occurs in pairs where if object a exerts a force “F” on object B, then object B exerts an equal and opposite force “–F” on object A. Thus, if a man standing on a boat in still water begins to walk towards the shore then in response to this, the boat will start moving away from the shore.
Sol. According to Newton’s third law of motion, every action has an equal and opposite reaction. This implies that force always occurs in pairs where if object a exerts a force “F” on object B, then object B exerts an equal and opposite force “–F” on object A. Thus, if a man standing on a boat in still water begins to walk towards the shore then in response to this, the boat will start moving away from the shore.
Q19. One micron represents a length of
एक माइक्रोन कितनी लंबाई को दर्शाती है-
(a) 10⁻⁶ m
(b) 10⁻⁴ m
(c) 10⁻³ m
(d) 1 m
एक माइक्रोन कितनी लंबाई को दर्शाती है-
(a) 10⁻⁶ m
(b) 10⁻⁴ m
(c) 10⁻³ m
(d) 1 m
S19. Ans.(a)
Sol. One micron represents a length of 10⁻⁶ m. While milli represents 10⁻³ m.
Sol. One micron represents a length of 10⁻⁶ m. While milli represents 10⁻³ m.
Q20. A body traveling with a speed of more than the velocity of sound in air is said to travel with
हवा में ध्वनि के वेग से अधिक की गति के साथ यात्रा करने वाले निकाय किस गति से यात्रा करेगा
(a) supersonic speed/ सुपरसोनिक गति
(b) hypersonic speed/ हाइपरसोनिक गति
(c) ultrasonic speed/ अल्ट्रासोनिक गति
(d) infrasonic speed/इन्फ्रासोनिक गति
हवा में ध्वनि के वेग से अधिक की गति के साथ यात्रा करने वाले निकाय किस गति से यात्रा करेगा
(a) supersonic speed/ सुपरसोनिक गति
(b) hypersonic speed/ हाइपरसोनिक गति
(c) ultrasonic speed/ अल्ट्रासोनिक गति
(d) infrasonic speed/इन्फ्रासोनिक गति
S20. Ans.(a)
Sol. Supersonic speed is a rate of travel of an object that exceeds the speed of sound. For objects travelling in dry air of a temperature of 20°C at sea level, this speed is approximately 343 m/s.
Sol. Supersonic speed is a rate of travel of an object that exceeds the speed of sound. For objects travelling in dry air of a temperature of 20°C at sea level, this speed is approximately 343 m/s.
Q21. A passenger in a moving train tosses a coin. If the coin falls behind him, the train must be moving with
चलती ट्रेन में एक यात्री एक सिक्का उछालता है। अगर सिक्का उसके पीछे गिरता है, तो ट्रेन _______ के साथ चल रही है.
(a) an acceleration / त्वरण
(b) a deceleration/ अवत्वरण
(c) a uniform speed/ समान गति
(d) any of the above/ उपर्युक्त में से कोई
चलती ट्रेन में एक यात्री एक सिक्का उछालता है। अगर सिक्का उसके पीछे गिरता है, तो ट्रेन _______ के साथ चल रही है.
(a) an acceleration / त्वरण
(b) a deceleration/ अवत्वरण
(c) a uniform speed/ समान गति
(d) any of the above/ उपर्युक्त में से कोई
S21. Ans.(a)
Sol. If the train were moving with uniform velocity, the coin would fall back to the passenger’s hand. While, if the train is accelerated, the horizontal velocity of the train would be more than that of the coin by the time the coin returns. Therefore, the train travels a greater horizontal distance than the coin and coin falls behind the passenger.
Sol. If the train were moving with uniform velocity, the coin would fall back to the passenger’s hand. While, if the train is accelerated, the horizontal velocity of the train would be more than that of the coin by the time the coin returns. Therefore, the train travels a greater horizontal distance than the coin and coin falls behind the passenger.
Q22. China wares are wrapped in the straw of paper before packing. This is the application of the concept of
चीन के माल पैकिंग से पहले कागज के पुआल में लिपटे हुए होते हैं। यह अवधारणा किस का अनुप्रयोग है
(a) impulse/ आवेग
(b) momentum/ गति
(c) acceleration / त्वरण
(d) force/ बल
चीन के माल पैकिंग से पहले कागज के पुआल में लिपटे हुए होते हैं। यह अवधारणा किस का अनुप्रयोग है
(a) impulse/ आवेग
(b) momentum/ गति
(c) acceleration / त्वरण
(d) force/ बल
S22. Ans.(a)
Sol. As a certain impulse applied for a short time will give a large force so the chinaware breaks into pieces. Therefore, chinaware is wrapped in straw of paper while packing so that the event of fall (impact) will take a longer time to reach the chinaware through straw of paper and hence the average force exerted on the chinaware is small and chances of its breaking reduce.
Sol. As a certain impulse applied for a short time will give a large force so the chinaware breaks into pieces. Therefore, chinaware is wrapped in straw of paper while packing so that the event of fall (impact) will take a longer time to reach the chinaware through straw of paper and hence the average force exerted on the chinaware is small and chances of its breaking reduce.
Q23. When a body is stationary, then
जब कोई निकाय स्थिर होता है, तब
(a) there is no force acting on it/ इस पर कोई बल नहीं है
(b) the body is in vacuum/ निकाय निर्वात में है
(c) the force acting on it is not in contact with it/ इस पर कार्य करने वाला बल इसके संपर्क में नहीं है
(d) the net forces acting on it balances each other/ इस पर कार्य करने वाला बल एक दूसरे को संतुलित करता हैं
जब कोई निकाय स्थिर होता है, तब
(a) there is no force acting on it/ इस पर कोई बल नहीं है
(b) the body is in vacuum/ निकाय निर्वात में है
(c) the force acting on it is not in contact with it/ इस पर कार्य करने वाला बल इसके संपर्क में नहीं है
(d) the net forces acting on it balances each other/ इस पर कार्य करने वाला बल एक दूसरे को संतुलित करता हैं
S23. Ans.(d)
Sol. For both stationary and moving objects with unchanging speed and direction, all the forces acting on the objects are in balance with each other, i.e. they all cancel each other.
Sol. For both stationary and moving objects with unchanging speed and direction, all the forces acting on the objects are in balance with each other, i.e. they all cancel each other.
Q24. What happens when a heavy object and a light object are allowed to fall from the certain height in the absence of air
जब एक भारी वस्तु और एक हल्की वस्तु को हवा की अनुपस्थिति में निश्चित ऊंचाई से गिरती है तब क्या होता है?
(a) heavy object reaches the ground later than the lighter object/भरी वस्तु हलकी वस्तु की तुलना में ज़मीन पर बाद में पहुंचता है
(b) lighter object reaches the ground later than the heavier object /हलकी वस्तु भरी वस्तु की तुलना में ज़मीन पर बाद में पहुँचता है
(c) both heavy and light objects reach the ground simultaneously / भारी और हल्की दोनों वस्तुएं एक साथ जमीन पर पहुंचती हैं
(d) None of these/इनमें से कोई नहीं
जब एक भारी वस्तु और एक हल्की वस्तु को हवा की अनुपस्थिति में निश्चित ऊंचाई से गिरती है तब क्या होता है?
(a) heavy object reaches the ground later than the lighter object/भरी वस्तु हलकी वस्तु की तुलना में ज़मीन पर बाद में पहुंचता है
(b) lighter object reaches the ground later than the heavier object /हलकी वस्तु भरी वस्तु की तुलना में ज़मीन पर बाद में पहुँचता है
(c) both heavy and light objects reach the ground simultaneously / भारी और हल्की दोनों वस्तुएं एक साथ जमीन पर पहुंचती हैं
(d) None of these/इनमें से कोई नहीं
S24. Ans.(c)
Sol. If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. This statement follows from the law of conservation of energy. However, if air resistance is present, then the shape of the object becomes important.
Sol. If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height. This statement follows from the law of conservation of energy. However, if air resistance is present, then the shape of the object becomes important.
Q25. An artificial satellite orbiting the earth does not fall down because of the earth’s attraction
पृथ्वी की परिक्रमा करने वाला एक कृत्रिम उपग्रह नीचे नहीं गिरता है क्यूंकि पृथ्वी का आकर्षण
(a) is balanced by the attraction of the moon/ चंद्रमा के आकर्षण से संतुलित है
(b) vanishes at such distances/ ऐसी दूरी पर गायब हो जाता है
(c) is balanced by the viscous drag produced by the atmosphere/ वायुमंडल द्वारा उत्पादित विस्कस खिंचाव द्वारा संतुलित किया जाता है
(d) produces the necessary acceleration of its motion in a curved path/ एक घुमावदार रास्ते में अपनी गति का आवश्यक त्वरण पैदा करता है
पृथ्वी की परिक्रमा करने वाला एक कृत्रिम उपग्रह नीचे नहीं गिरता है क्यूंकि पृथ्वी का आकर्षण
(a) is balanced by the attraction of the moon/ चंद्रमा के आकर्षण से संतुलित है
(b) vanishes at such distances/ ऐसी दूरी पर गायब हो जाता है
(c) is balanced by the viscous drag produced by the atmosphere/ वायुमंडल द्वारा उत्पादित विस्कस खिंचाव द्वारा संतुलित किया जाता है
(d) produces the necessary acceleration of its motion in a curved path/ एक घुमावदार रास्ते में अपनी गति का आवश्यक त्वरण पैदा करता है
S25. Ans.(d)
Sol. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of earth provides the necessary acceleration for its motion. This acceleration is “constant” in magnitude but “changing in direction”. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30,000 km/hr. The speed must be great enough so gravity brings the satellite back to Earth but not so great that the satellite escapes gravity out into space.
Sol. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of earth provides the necessary acceleration for its motion. This acceleration is “constant” in magnitude but “changing in direction”. By the launch rocket, immediately before the satellite is established in the predetermined orbit, the speed given to it is 30,000 km/hr. The speed must be great enough so gravity brings the satellite back to Earth but not so great that the satellite escapes gravity out into space.
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