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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.

2,881.

When a biro pen rubbed on a dry silk cloth is moved very close to a piece of paper on a dry table, the pen is found to pick up the paper. This is because

A.

both the pen and the cloth are magnetized

B.

the pen is magnetized but the cloth is not

C.

the pen is charged while the cloth is magnetized

D.

both the pen and the cloth are charged

Correct answer is D

They are all charged either positively or negatively

2,882.

Which of the following has the lowest internal resistance when new?

A.

leclanche cell

B.

Daniel cell

C.

Accumulator

D.

Torch battery

Correct answer is C

No explanation has been provided for this answer.

2,883.

If the Nigeria flag (green, white, green) is viewed in pure yellow light, which of the following set of colours would be observed on the flag?

A.

Green, yellow, green

B.

Red, yellow, red

C.

black, yellow, black

D.

Green, white, green

Correct answer is A

No explanation has been provided for this answer.

2,884.

In a projection lantern of focal length f, the object distance u, is such that

A.

u > 2f > f

B.

u < f < 2f

C.

u = f < 2f

D.

f < u < 2f

Correct answer is D

No explanation has been provided for this answer.

2,885.

An object is placed in front of a converging lens of a focal length 20cm. The image is virtual and has a magnification of 2. What is the distance of the object from the lens?

A.

5cm

B.

10cm

C.

30cm

D.

40cm

Correct answer is B

V = -2u

F = uvu+v

20 = uv2uu2u

u = 10cm