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Physics MCQs for NEET — Practice Questions with Answers

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If force on a rocket having exhaust velocity of 300 m/sec is 210 N, then rate of combustion of the fuel is

0.7 kg/s

1.4 kg/s

0.07 kg/s

10.7 kg/s

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Explanation

$F = u (\frac{d m}{d t})$ ⇒ $\frac{d m}{d t} = \frac{F}{u} = \frac{210}{300} = 0 .7 k g / s$

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In an elevator moving vertically up with an acceleration g, the force exerted on the floor by a passenger of mass M is

$\frac{1}{2} M g$

Zero

2 Mg

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Explanation

$R = m (g + a) = m (g + g) = 2 m g$

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A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 ms^–1. To give an initial upward acceleration of 20 ms^–2, the amount of gas ejected per second to supply the needed thrust will be (g = 10 ms^–2)

127.5 kg s^–1

187.5 kg s^–1

185.5 kg s^–1

137.5 kg s^–1

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Explanation

$F = \frac{u d m}{d t} = m (g + a)$

⇒ $\frac{d m}{d t} = \frac{m (g + a)}{u} = \frac{5000 \times (10 + 20)}{800} = 187 .5 k g / s$

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If a person with a spring balance and a body hanging from it goes up and up in an aeroplane, then the reading of the weight of the body as indicated by the spring balance will

Go on increasing

Go on decreasing

First increase and then decrease

Remain the same

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Explanation

Initially due to upward acceleration apparent weight of the body increases but then it decreases due to decrease in gravity.

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A body is imparted motion from rest to move in a straight line. If it is then obstructed by an opposite force, then

The body may necessarily change direction

The body is sure to slow down

The body will necessarily continue to move in the same direction at the same speed

None of these

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Explanation

Opposite force causes retardation.

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A second's pendulum is mounted in a rocket. Its period of oscillation decreases when the rocket

Comes down with uniform acceleration

Moves round the earth in a geostationary orbit

Moves up with a uniform velocity

Moves up with uniform acceleration

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Explanation

$T = 2 π \sqrt{\frac{l}{g_{e f f}}}$ . T will decrease, if $g_{e f f}$ increases.

It is possible when rocket moves up with uniform acceleration a. Then $g_{e f f}$ = g + a

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Two balls of masses m₁ and m₂ are separated from each other by a powder charge placed between them. The whole system is at rest on the ground. Suddenly the powder charge explodes and masses are pushed apart. The mass m₁ travels a distance s₁ and stops. If the coefficients of friction between the balls and ground are same, the mass m₂ stops after travelling the distance

$s_{2} = \frac{m_{1}}{m_{2}} s_{1}$

$s_{2} = \frac{m_{2}}{m_{1}} s_{1}$

$s_{2} = \frac{m_{1}^{2}}{m_{2}^{2}} s_{1}$

$s_{2} = \frac{m_{2}^{2}}{m_{1}^{2}} s_{1}$

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A force vector applied on a mass is represented as $\vec{F} = 6 \hat{i} - 8 \hat{j} + 10 \hat{k}$ and accelerates with 1 m/s². What will be the mass of the body

$10 \sqrt{2} k g$

$2 \sqrt{10} k g$

10 kg

20 kg

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Explanation

$m = \frac{F}{a} = \frac{\sqrt{6^{2} + 8^{2} + 10^{2}}}{1} = \sqrt{200} = 10 \sqrt{2} k g$

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A cricket ball of mass 250 g collides with a bat with velocity 10 m/s and returns with the same velocity within 0.01 second. The force acted on bat is

25 N

50 N

250 N

500 N

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Explanation

Force $= m (\frac{d v}{d t}) = \frac{0 .25 \times [(10) - (- 10)]}{0 .01} = 25 \times 20 = 500 N$

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A pendulum bob of mass 50 gm is suspended from the ceiling of an elevator. The tension in the string if the elevator goes up with uniform velocity is approximately

0.30 N

0.40 N

0.42 N

0.50 N

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Explanation

$T = m g = 50 \times 10^{- 3} \times 10 = 0 .5 N$

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