Question # 1

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

If d is the displacement of the body in time t, then its average velocity will be

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V_av= d x t

V_{av = t/d}

V_{av = d/t}

Linear momentum is a

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fixed quantity

constant quantity

scalar quantity

vector quantity

Swimming is based on the principle of

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Newton's 1st law

Newton's 2nd law

Newton's 3rd law

All

If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine, is (Take g=9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

Distance covered by a freely failing body n the first second of its motion will be:

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4.9 m

9.8 m

19.6 m

29.4 m

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car?

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60 km/hr

80 km/hr

120 km/hr

180 km/hr

A body starting from rest covers a distance of 0.45 Km and acquires a velocity of 300 Kmh^-1. its acceleration will be

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7.71 m s^-2

0.5m s^-2

0.15m s^-2

0.092m s^-2

Work done along a closed path in a gravitational force is:

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maximum

Minimum

Zero

Unity

A 5 kg mass is falling freely, the force acting on, it will be

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19.6 N

9.8 N

5 N

Zero

A ball is dropped from a height of 4.2 meters. To what height will take it rise if there is no loss of KE after rebounding?

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4.2 m

8.4 m

12.6 m

none of these

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

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Physics ECAT Pre Engineering Chapter 3 Motion and Force Online Test MCQs With Answers

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