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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.

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421.

Which of the following statements about radioactivity is true?

(i) Alpha particle is positively charged

(ii) Beta particle is negatively charged

(iii) Gamma ray is neutral

(iv) Beta particle has the same mass as helium atom

(v) Gamma ray is charged.

i, ii, iii, iv only

i, ii, iii only

iv and v only

i, ii and v only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

422.

In what range of temperature is the expansion of water anomalous?

+208 $^o$ C to +212 $^o$ C

-80 $^o$ C + -76 $^o$ C

0 $^o$ C to +4 $^o$ C

-4 $^o$ C to +0 $^o$ C

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

423.

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?

$\frac{\pi}{2}$

$\frac{1}{4}$

View answer & explanation

Correct answer is D

In a simple pendulum, T = 2 $\pi$ $\sqrt{\frac{L}{g}}$

$\frac{T_1}{T_2} = \sqrt{\frac{L_1}{L_2}}$ but L $_2$ = 4L $_1$

$\frac{T_1}{T_2} = \sqrt{\frac{L_1}{4L_1}}$

T $_2$ = 2T $_1$

424.

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms $^{-1}$ . The recoil speed of the machine gun is

0.5 ms $^{-1}$

1.5 ms $^{-1}$

1 ms $^{-1}$

2ms $^-1$

View answer & explanation

Correct answer is C

Gun Momentum = bullet momentum

M $_a$ V $_a$ = M $_b$ V $_b$

5 x V $_a$ = 0.05 x 100

V $_a$ = 1m $^{-1}$

425.

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

$\frac{mv^2}{r}$

$\frac{mr^2}{x}$

$\frac{mr}{v}$

$\frac{mv}{r^2}$

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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