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.

466.

If a body moves with a constant speed and at the same time undergoes an acceleration, its motion is said to be

A.

circular

B.

oscillatory

C.

rectilinear

D.

rotational

Correct answer is A

No explanation has been provided for this answer.

467.

The lower fixed part of a faulty thermometer reads 2°C while the upper fixed point is 100°C.
What is the true temperature when the thermometer reads 51°C?

A.

52°C

B.

50°C

C.

49°C

D.

46°C

Correct answer is B

C\(_{\theta}\) = 50, C\(_0\) = 2, C\(_{100}\) = 100

θ = C\(_{\theta}\) - C\(_0\)
C\(_{100}\) - C\(_0\)
× 100 = 51 - 2
100 - 2
× 100

 

= 49
98
× 100


θ = 50°C.

468.

The resultant capacitance in the figure above is

A.

0.4μf

B.

0.8μf

C.

1.8μf

D.

4.5μf

Correct answer is B

For the parallel arrangement = 2 + 4 = 6μf

For the series arrangement = 1
C\(_T\)
= 1
2
+ 1
3
+ 1
6
+ 1
4

 

1
C\(_T\)
= 15
12
 

 

C\(_T\) = 12
15
= 0.8μf

469.

The point at which the molecules of a loaded wire begin to slide across each other resulting in a rapid increase in extension is

A.

yield point

B.

proportionality point

C.

deformation point

D.

elastic point

Correct answer is A

-yield point is where a small increase in load produces a large extention.

470.

In which of the points labelled A, B, C, D and E on the conductor shown would electric charge tend to concentrate most

A.

A

B.

B

C.

C

D.

E

Correct answer is D

- Charge are mostly concentrated at the outermost part of a hollow conductor
- Charge are also mostly concentrated at the pointed ends or places with high density point.