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In this website each webpage contains minimum 10 mcqs and maximum upto 30 mcqs (objective type questions), one liner questions etc.
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Physics MCQs | Objective Type Questions SET-37
Q1. The earth wire of a cable is connected to
(a) the outer metallic body of the appliance
(b) the fuse of the appliance
(c) the filament of the appliance
(d) short circuitry of the appliance
Ans. : (b) the fuse of the appliance
Q2. Water Is used in car radiator because of its
(a) low density
(b) easy availability
(c) high specific heat capacity
(d) low boiling point
Ans. : (c) high specific heat capacity
Q3. How much mechanical work must be done to completely melt 1 gram of ice at 0°C?
(a) 2 J
(b) 80 J
(c) 336 J
(d) 2268 J
Ans. : (b) 80 J
Q4. A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is
(a) zero
(c) less than one
(d) more than one
(b) one
Ans. : (a) zero
Q5. The layer of atmosphere used for radio wave transmission is
(a) chromospheres
(b) troposphere
(c) ionosphere
(d) stratosphere
Ans. : (c) ionosphere
Q6. Negative feedback in amplifiers
(a) increases bandwidth and decreases noise
(b) decreases bandwidth and decreases noise
(c) increases bandwidth and increases noise
(d) decreases bandwidth and increases noise
Ans. : (a) increases bandwidth and decreases noise
Q7. Water cannot be used to extinguish fire caused by electric current because
(a) it may cause electrocution
(b) it may cause hydrolysis
(c) it may cause electrolysis
(d) it may spoil the wiring
Ans. : (a) it may cause electrocution
Q8. A periscope works on the principle of
(a) refraction
(b) total internal reflection
(c) diffraction
(d) reflection
Ans. : (b) total internal reflection
Q9. A copper disc has a hole. If the disc is heated the size of the hole
(a) increases
(b) decreases
(c) No change
(d) first increases and than decreases
Ans. : (a) increases
Q10. A rearview mirror for driving is
(a) plain
(b) concave
(c) convex
(d) inverted
Ans. : (c) convex
