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IMPORTANT

Earn 100

The displacement $y$ (in metres) of a body varies with time $t$ (in seconds) as $y = \frac{- 2}{3} t^{2} + 16 t - 12$ . Then, the body will come to rest in

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Important Questions on Measurement, Motion and Force

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 23

7 kg

object is subjected to two forces

{\vec{F}}_{1} = (20 \hat{i} + 30 \hat{j})

and

{\vec{F}}_{2} = (8 \hat{i} + 5 \hat{j}) N

. The magnitude of resulting acceleration in

m s^{- 2}

will be

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 25

A rifle with muzzle velocity of

1500 m s^{- 1}

shoots a bullet at a small target

150 m

away. How high above the target must the rifle be aimed, so that bullet hits the target? (Take

g = 9.8 m s^{- 2}

)

EASY

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 26

A mass of

2 kg

is whirled in a circle in a horizontal plane, at an initial speed of

5 revolutions per \min

. Keeping the radius constant, the speed is increased so that the centripetal force is four times the initial value. The ratio of the final speed to the initial speed is

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 27

Which one of the following graphs represents uniform motion?

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 28

Which one of the following characteristics of the particle does the shaded area of the velocity-time graph shown below represent?

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 29

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The motion of the car along a straight path is shown in the above figure. The car starts from $O$ and reaches at point $C$ , back to point $A$ . The distance and the magnitude of the displacement are, respectively.

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IMPORTANT

Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 1 - Measurement, Motion and Force>Practice Exercise>Q 30

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