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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

431.

The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
(ρm = 13.6g/cm3 ρ = 0.00013g/cm3 )

A.

380mmHg

B.

570mmHg

C.

190mmHg

D.

480mmHg

Correct answer is B

ρmhm = ρaha
13.6(760 - p) × 103 = 13 × 105(20 × 103)

432.

The equilibrium position of objects in any field corresponds to situation of

A.

equipotential energy

B.

maximum potential energy

C.

minimum potential energy

D.

minimum kinetic energy

Correct answer is C

Potential energy = mgh = (mg)h = force × distance
⇒ 0 × d = 0

Mr = 2
40
= 0.05kg

434.

A body moves in SHM between two point 20m on the straight line Joining the points. If the angular speed of the body is 5 rad/s. Calculate its speed when it is 6m from the center of the motion

A.

20 m/s

B.

30 m/s

C.

40 m/s

D.

50 m/s

Correct answer is C

From two parts 20m apart
a = 10m, x = 6m, A = 5
V = ωA2X2  = 510262 = 40m/s

435.

The volume of a stone having an irregular shape can be determined using?

A.

meter rule

B.

measuring cylinder

C.

vernier calliper

D.

micrometer screw gauge

Correct answer is B

The volume of object is the same as the volume of liquid displaced in a container such as measuring cylinder.