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.

436.

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

437.

The diagram shows a uniform meter rule AB which balances horizontally at the 90cm mark when a mass of 0.2kg is suspended from B. Calculate the mass of the meter rule.

A.

0.05kg

B.

0.20kg

C.

0.80kg

D.

1.00kg

Correct answer is A

M\(_r\)(90 - 50) = 0.2(100 - 90)
40M\(_r\) = 0.2 × 10

M\(_r\) = 2
40
= 0.05kg

438.

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 = ω\(\sqrt{A^2 - X^2}\)  = 5\(\sqrt{10^2 - 6^2}\) = 40m/s

439.

In Sunlight, a blue flower looks blue because we see the flower by the light it

A.

receives from our eyes

B.

disperses

C.

absorbed

D.

reflect

Correct answer is D

Colours presented by objects are the ones reflected

440.

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.