Physics MCQs For UPSC(NDA/NA) Exam
UPSC NDA/NA PHYSICS MCQ Q.1
The audible frequency range of a human ear is
(a) 20 Hz to 200 Hz
(b) 2 Hz to 20 Hz
(c) 200 Hz to 2000 Hz
(d) 20 Hz to 20000 Hz
Ans.(d)
UPSC NDA/NA PHYSICS MCQ Q.2
Which one of the following is the resistance that must be placed parallel with 12 ohm resistance to obtain a combined resistance of 4 ohm ?
(a) 2 ohm
(b) 4 ohm
(c) 6 ohm
(d) 8 ohm
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.3
An electric iron of resistance 20 ohm takes a current of 5 A. The heat developed in joules in 30 s is
(a) 5 kJ
(b) 10 kJ
(c) 15 kJ
(d) 20 kJ
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.4
A house, served by a 220 V supply line, is protected by a 9 A fuse. What is the maximum number of 60 W bulbs that can be turned on in parallel?
(a) 11
(b) 22
(c) 33
(d) 44
Ans.(c)
UPSC NDA/NA PHYSICS MCQ Q.5
An object is placed at a distance of 12 cm from a convex lens on its principal axis and a virtual image of certain size is formed. If the object is moved further 8 cm away from the lens, a real image of the same size as that of the virtual image is formed. Which one of the following is the focal length of the lens.
(a) 15 cm
(b) 16 cm
(c) 18 cm
(d) 20 cm
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.6
Equal quantities (50 mL) of the following four samples of water are placed in four beakers of 100 mL capacity. Their boiling points are determined accurately using the same thermometer. Which sample of the water will have the lowermost boiling point as compared to other three samples?
(a) Distilled water
(b) Bottled mineral water
(c) Well water
(d) Seawater
Ans.(d)
UPSC NDA/NA PHYSICS MCQ Q.7
Different objects at different distances are seen by the eye. The parameter that remains constant is the
(a) focal length of the eye lens
(b) object distance from the eye lens
(c) radii of curvature of the eye lens
(d) image distance from the eye lens
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.8
Water flows out of the hole of a bucket and follows a parabolic path. If the bucket falls freely under gravity, the water flow (ignoring air resistance)
(a) follows a straight-line path relative to the falling bucket.
(b) follows a parabolic path relative to the falling bucket.
(c) stops
(d) decreases but continues to flow
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.9
Which of the following is the best example of the law of conservation of mass?
(a) when 12 gram of carbon is heated in vacuum, there is no change in mass
(b) weight of platinum wire is the same before and after heating
(c) a sample of increases in volume when heated at constant pressure but mass remains unchanged
(d) 12 g of carbon combines with 32 gram of oxygen to give 44 g of carbon dioxide.
Ans.(d)
UPSC NDA/NA PHYSICS MCQ Q.10
Which among the following thermometers is preferred for measuring temperature around 1250 degree C?
(a) Mercury thermometer
(b) constant volume gas thermometer
(c) optical pyrometer
(d) Platinum resistance thermometer
Ans.(c)
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