Which one of the following is a modern tank?
- (a)Bhim
- (b)Akash
- (c)Arjun
- (d)Prithvi
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Official answer(c) Arjun
Science & Technology
923 questions asked in UPSC Prelims.
Which one of the following is a modified stem?
- (a)Carrot
- (b)Sweet potato
- (c)Coconut
- (d)Potato
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Official answer(d) Potato
Fat present below the skin surface in our body acts as a barrier against
- (a)loss of heat from the body
- (b)loss of essential body fluids
- (c)loss of salts from the body
- (d)entry of harmful micro-organisms from the environment
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Official answer(a) loss of heat from the body
Which of the following professional(s) are more likely to run the risk of a permanent change in their cell’s DNA? I. Researchers using carbon-14 isotope II. X-ray technician III. Coal miner IV. Dyer and painter Select the correct answer using the codes given below:
- (a)II alone
- (b)I, II and III
- (c)I, II and IV
- (d)I, III and IV
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Official answer(c) I, II and IV
Which one of the following is NOT an essential micronutrient for plants?
- (a)Boron
- (b)Zinc
- (c)Sodium
- (d)Copper
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Official answer(c) Sodium
Of the four landmarks in medical history given below, which one was the first to take place?
- (a)Organ transplant
- (b)Bypass surgery
- (c)Test-tube baby
- (d)Plastic surgery
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Official answer(d) Plastic surgery
The nutritional deficiency condition that needs to be given top priority for remedial action in India today is
- (a)Scurvy
- (b)Rickets
- (c)Xerophthalmia
- (d)Pellagra
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Official answer(c) Xerophthalmia
Living organisms require at least 27 elements, of which 15 are metals. Among these, those required in major quantities include
- (a)Potassium, Manganese, Molybdenum & Calcium
- (b)Potassium, Molybdenum, Copper & Calcium
- (c)Potassium, Sodium, Magnesium & Calcium
- (d)Sodium, Magnesium, Copper & Manganese
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Official answer(c) Potassium, Sodium, Magnesium & Calcium
Match List I with List II and select the correct answer using the codes given below the lists: List I I. Vitamin II. Enzyme III. Hormone IV. Protein List II A. Pepsin B. Carotene C. Keratin D. Progesterone
- (a)I – A, II – B, III – C, IV – D
- (b)I – B, II – A, III – D, IV – C
- (c)I – B, II – A, III – C, IV – D
- (d)I – A, II – B, III – D, IV – C
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Official answer(b) I – B, II – A, III – D, IV – C
It is possible to produce seedless tomato fruits by
- (a)applying trace elements in tomato fields
- (b)spraying mineral solution on plants
- (c)spraying hormones on flowers
- (d)applying fertilisers containing radioactive elements
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Official answer(c) spraying hormones on flowers
Which of the following are associated with diabetes mellitus, a common disease in adults? I. Higher sugar level in blood II. Lower sugar level in blood III. Lower insulin level in blood IV. Higher insulin level in blood Select the correct answer using the codes given below:
- (a)I and IV
- (b)I and II
- (c)II and III
- (d)I and III
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Official answer(d) I and III
Consider the following statements: AIDS is transmitted — I. By sexual intercourse. II. By blood transfusion. III. By mosquitoes and other blood-sucking insects. IV. Across the placenta. Of these statements —
- (a)I, II and III are correct
- (b)I, II and IV are correct
- (c)I, III and IV are correct
- (d)I and III are correct
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Official answer(b) I, II and IV are correct
Which of the following would lead to ‘malnutrition’? I. Overnutrition II. Undernutrition III. Imbalanced nutrition Select the correct answer using the codes given below:
- (a)II alone
- (b)II and III
- (c)I and III
- (d)I, II and III
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Official answer(d) I, II and III
People drinking water from a shallow hand pump are likely to suffer from all of the following diseases, except
- (a)Cholera
- (b)Typhoid
- (c)Jaundice
- (d)Fluorosis
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Official answer(d) Fluorosis
Besides proteins and carbohydrates, other elements of nutritional value found in milk include
- (a)calcium, potassium and iron
- (b)calcium and potassium
- (c)potassium and iron
- (d)calcium and iron
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Official answer(b) calcium and potassium
I. ‘A’ stood first in the race. II. ‘C’ led all the way. III. ‘D’ ran faster than others in the later part of the race. Of these statements
- (a)I and III are false and II is true
- (b)I and II are false and III is true
- (c)I and III are true and II is false
- (d)I is true and II and III are false
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Official answer(b) I and II are false and III is true
When an air bubble at the bottom of a lake rises to the top, it will
- (a)increase in size
- (b)decrease in size
- (c)maintain its size
- (d)flatten into a disk-like shape
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Official answer(a) increase in size
When a mirror is rotated by an angle of θ, the reflected ray will rotate by
- (a)0°
- (b)θ / 2
- (c)θ
- (d)2θ
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Official answer(d) 2θ
A truck, a car and a motor cycle have equal kinetic energies. If equal stopping ...
- (a)x > y > z
- (b)x < y < z
- (c)x = y = z
- (d)x 4y 8z
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Official answer(a) x > y > z
A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be
- (a)as shown in figure (a)
- (b)as shown in figure (b)
- (c)as shown in figure (c)
- (d)as shown in figure (d)
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Official answer(d) as shown in figure (d)
The variation of displacement (d) with time (t) in the case of a particle falling freely under gravity from rest is correctly represented by which of the following graphs?
- (a)graph (a)
- (b)graph (b)
- (c)graph (c)
- (d)graph (d)
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Official answer(a) graph (a)
Total internal reflection can take place when light travels from
- (a)diamond to glass
- (b)water to glass
- (c)air to water
- (d)air to glass
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Official answer(a) diamond to glass
Assertion (A): Transformer is useful for stepping up or stepping down voltages. Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?
- (a)Both A and R are true and R is the correct explanation of A.
- (b)Both A and R are true but R is not a correct explanation of A.
- (c)A is true but R is false.
- (d)A is false but R is true.
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Official answer(c) A is true but R is false.
Domestic electrical wiring is basically a
- (a)series connection
- (b)parallel connection
- (c)combination of series and parallel connections
- (d)series connection within each room and parallel connection elsewhere
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Official answer(b) parallel connection
Consider the following statements: At the present level of technology available in India, solar energy can be conveniently used to I. Supply hot water to residential buildings. II. Supply water for minor irrigation projects. III. Provide street lighting. IV. Electrify a cluster of villages and small towns. Of these statements
- (a)I, II, III and IV are correct
- (b)I and IV are correct
- (c)I and III are correct
- (d)I, II and III are correct
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Official answer(d) I, II and III are correct