Motion Test

Result

Motion Test - 75

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Weekly Quiz Competition

Question 1
1 / -0

A car is moving on a circular track of radius R covering equal distance in equal intervals of time. This shows that the car has

A
uniform speed and acceleration of constant magnitude

B
Non-uniform velocity and acceleration

C
uniform velocity and zero acceleration

D
Both (1) and (2)

Solution
Question 2
1 / -0

Starting from rest objects $$1$$ falls freely for $$4$$ seconds and object $$2$$ falls freely for $$8$$ seconds .Compared to object $$1$$, object $$2$$ falls

A
half as far

B
twice as far

C
four times as far

D
sixteen times as far

Solution
Question 3
1 / -0

A rocket of initial mass $$5000 kg$$ ejects gets at a constant rate of $$60kg/s$$ with a relative speed of $$2050 m/s$$. Acceleration of the rocket 15 second after it is blasted off from the surface of earth will be ($$g = 10m/{s}^{2}$$?)

A
$$10m/{s}^{2}$$

B
$$20m/{s}^{2}$$

C
$$30m/{s}^{2}$$

D
$$40m/{s}^{2}$$

Solution
Question 4
1 / -0

A particle is moving in x-y plane . At certain instant of time. The components of its velocity and acceleration are as follows $$V_x=3\ m/s$$, $$V_y = 4\ m/s$$, $${ a }_{ x }=2\ m/s^{ 2 }$$ and $${ a }_{ y }=1\ m/s^{ 2 }$$ The rate of change of speed at this moment is

A
$$\sqrt { 10 }\ m/{ s }^{ 2 }$$

B
$$\sqrt { 4 }\ m/{ s }^{ 2 }$$

C
$$\sqrt { 5 }\ m/{ s }^{ 2 }$$

D
$$\sqrt { 2 }\ m/{ s }^{ 2 }$$
Question 5
1 / -0

A particle is moving in x-y plane . At certain instant of time. The components of its velocity and acceleration are as follows $$V_x = 3\ m/s$$, $$V_y = 4\ m/s$$, $${ a }_{ x }=2\ m/s^{ 2 }$$ and $${ a }_{ y }=1\ m/s^{ 2 }$$. The rate of change of speed at this moment is

A
$$\sqrt { 10 } m/{ s }^{ 2 }$$

B
$$\sqrt { 4 } m/{ s }^{ 2 }$$

C
$$\sqrt { 5 } m/{ s }^{ 2 }$$

D
$$\sqrt { 2 } m/{ s }^{ 2 }$$

Solution
Question 6
1 / -0

Is it possible for an object's velocity to increase while its acceleration decreases?

A
No, this is impossible because of the way in which acceleration is defined.

B
No, because if acceleration is decreasing the object will be slowing down.

C
No, because velocity and acceleration must always be in the same direction.

D
Yes, an example would be a falling object in a viscous medium, where the acceleration continuously decreases but velocity increases until a certain point.

Solution
Question 7
1 / -0

What is the angle between instantaneous displacement and acceleration during the retarded motion

A
zero

B
$$

\pi

$$

C
$$

\frac{\pi}{2}

$$

D
$$

\frac{\pi}{4}

$$

Solution
Question 8
1 / -0

The position-time $$(x - t)$$ graph for a body thrown vertically upwards from ground is best shown by

A

B

C

D

Solution
Question 9
1 / -0

Corresponding to the process shown in figure, what is heat given to the gas in the process ABCA ?

A
1 J

B
$$ \dfrac {3}{2} J $$

C
$$\dfrac{1}{2}$$J

D
0
Question 10
1 / -0

In a motion with constant acceleration the velocity is reduced to zero in $$5$$ seconds and after covering a distance of $$100\ m$$. The distance covered by the particle in next $$5$$ second will be :-

A
zero

B
250 m

C
100 m

D
500 m