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.

476.

A single force which produces the same effect as a set of forces acting together at a point is known as the

A.

component

B.

equilibrant

C.

resultant

D.

resistant

Correct answer is C

Resultant is the representing vector for multiple forces.

477.

Radio waves belongs to the class of waves whose velocity is about

A.

340m/s

B.

3 × 10\(^{6}\) m/s

C.

3 × 10\(^{8}\) m/s

D.

3 × 10\(^{-8}\) m/s

Correct answer is C

3 × 10\(^{8}\) m/s

479.

One newton × One meter equals?

A.

One water

B.

One Joule

C.

One ampere

D.

One kilogram

Correct answer is B

1N × 1m = 1Nm = 1 Joul (F × d = Work/Energy)

480.

When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces at a speed of

A.

2 m/s

B.

4 m/s

C.

8 m/s

D.

12 m/s

Correct answer is C

v = d
t
or v α d


d = x, v = 4m/s
d = 2x, v = ? (girl & image)

v = 2 × 4
x
= 8 m
s