{"with velocity $v_{2}$ for the other half of the time. Find the mean velacity of the point averaged over the whole time of motion.","3. A car starts moving rectilinearly, first with acceleration $w = 5.0 ms^{- 2}$ (the initial velocity is equal to zero), then uniformly, and finally, decelerating at the same rate w, comes to a stop. The total time of motion equals $t = 25.5$ . The average velocity during that time is equat to $(v) = 72 km h^{- 1}$ . How long does the car move uniformly?","4. A point moves rectilinearly in one direction. Fig- $1.1$ shows the distance s traversed by the point as a function of the time t. Using the plot find:","(a) the average velocity of the"}

Topic:

Mechanics

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Question 2

Which of the following is not a dimensionless variable?

Refractive Index
Relative density
Angular displacement
Angular velocity

Topic:

Heat & Thermodynamics

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Question 3

The change in the position of an object with respect to its background when observed from two different positions is called *

parsec
Illusion
Parallax
Eye defect

Topic:

Heat & Thermodynamics

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Question 4

A SONAR uSES waves to detect and locate objects under water. *

Infrasonic waves
Ultrasonic waves
Audible waves
Supersonic waves

Topic:

Heat & Thermodynamics

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Question 5

The number of significant figures in

0.0023080

will be

Topic:

Heat & Thermodynamics

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Question 6

(b) A stone is dropped from the top of a cliff and is found to travel

14.7 m

in the last second before it reaches the ground. Find the height of the chiff. [Ans.

19.6 m

]

Topic:

Waves & Oscillation

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Question 7

Q: Jwo paticles of mass

5 leg

and

10 kg

respectinely are attached Jel lo the two ends of a rigid nod of length Im with of negligible mass. The centre of mass of the system fom the

5 kg

paricle is nearly at a dislance of:

Topic:

Mechanics

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Question 8

A man weighing

50 kg wt

supports a body of

25 kg wt

on his head. What is the work done when he moves a distance of

20 m

up an incline of 1 in

10 l e f t (g = 9.8 m s^{- 2} i g h t)

? [Ans. 1470 J]

Topic:

Optics

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Question 9

A car at rest accelerates uniformly to a speed of

40 ms^{- 1}

20 s

. How much distance is covered by the car?

$400 m$
$200 m$
$400 cm$
$200 cm$

Topic:

Heat & Thermodynamics

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Question 10

Which of the following statement for an object in equilibrium is not true?

The object must be at rest
The object can be at rest
The object is moving at constant speed
The acceleration of object is zero

Topic:

Heat & Thermodynamics

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Question 11

Ratio of gravitational force, electromagnetic force and nuclear force is

$1 : 1 0^{25} : 1 0^{36}$
1: 10 $^{36 : 1 0^{38}}$
$1 0^{25} : 1 0^{35} : 1 0^{39}$
1:1013:1025

Topic:

Heat & Thermodynamics

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Question 12

The number of significant figure in

3.04 \times 1 0^{23}

is :

Topic:

Heat & Thermodynamics

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Question 13

h

is the height and

g

is acceleration due to gravity, the dimensional formula of

\frac{2 h}{g}

is the same as that of :- (a) Time

Mass
Volume
velocity

Topic:

Heat & Thermodynamics

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Question 14

A body moving at

2 m / s

an be stoped does not depend on the initial direction.

the speed does not depend on the initial direction. distance $x$ . If its kinetic energy is doubled, how long will it go before coming to rest, if the retarding force remains unchanged ?
$x$
$2 x$
$4 x$
$8 x$