Free Printable Unit Test class

1.

The acceleration of a particle starting from rest varies with time t according to the equation: a = kt + c where k and c are constants. At time t, the velocity of the particle is

a)

kt + ct

b)

½(kt²) + ct

c)

½(kt²) + 1/2(ct²)

d)

kt² + ct

2.

If a particle travels a linear distance at speed V₁ and comes back along the same track at speed V₂:

a)

Its average speed is arithmetic mean (V₁ + V₂)/2

b)

Its average speed is $\sqrt{V_1V_2}$

c)

Its average speed is $\frac{2V_1V2}{V_1\ +\ V_2}$

d)

None of these

3.

The displacement s of a point moving in a straight line is given by, S = 8t² + 3t – 5, ‘S’ being in cm and 't' in s. The acceleration of the particle is:

a)

$5ms^{-2}$

b)

$2ms^{-2}$

c)

$3ms^{-2}$

d)

$8ms^{-2}$

4.

Find the incorrect statement out of the following:

a)

If acceleration = 0, motion is uniform

b)

If acceleration = constant, acceleration is uniform but motion not uniform

c)

If acceleration $\ne$ constant, both acceleration and motion are not uniform

d)

Acceleration = constant both acceleration and motion are uniform

5.

The velocity of a body depends on time according to the equation V = 20 + 0.1t². The body is undergoing:

a)

Uniform acceleration

b)

Uniform retardation

c)

Non–uniform acceleration

d)

Zero acceleration

6.

A body starting from rest covers a distance of 9 m in the fifth second. The acceleration of the body is:

a)

2 m/s²

b)

0.2 m/s²

c)

1.8 m/s²

d)

4 m/s²

7.

Fermi is the unit of ....

a)

Electric flux

b)

Time

c)

Mass

d)

Lenght

8.

If the dimensions of a physical quantity are given by [ $M^aL^bT^c$ ], then the physical quantity will be

a)

Force, if a = -1, b = 0, c = -2

b)

Velocity, if a = 1, b = 0, c = 1

c)

acceleration, if a = 1, b = 1, c = -2

d)

pressure, if a = 1, b = -1, c = -2

9.

The length, breadth and height of a rectangular block of The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate. If the maximum error in the measurement of force and length are respectively 4% and 2%, The maximum error in the measurement of pressure is

a)

1%

b)

2%

c)

6%

d)

8%

10.

Which of the following set have different dimensions?

a)

Pressure, Young’s modulus, stress

b)

e.m.f, potential difference, electric potential

c)

Heat, work done, energy

d)

dipole moment, electric flux, electric field

11.

A body is projected at an angle $\theta$ such that height is equal to range. The value $\theta$ is

a)

$\sin^{-1}4$

b)

$\cos^{-1}4$

c)

$\tan^{-1}4$

d)

$\tan^{-1}2$

12.

What angle of projection would result in a ball traveling the maximum horizontal distance? (Neglect air resistance)

a)

$90^0$

b)

$45^0$

c)

$25^0$

d)

$35^0$

13.

A projectile is fired a velocity of 150 meters per second at an angle of 30 degrees with the horizontal. What is the magnitude of the velocity at the maximum height of the projectile ?

a)

$\frac{150\sqrt{3}}{4}$ m/s

b)

$75$ m/s

c)

$\frac{150\sqrt{3}}{2}$

d)

$150\sqrt{3}$

14.

A rigid ball of mass m strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure. The change in speed of the ball will be

a)

Zero

b)

$2V\sin\theta$

c)

$2V\cos\theta$

d)

$2V\tan\theta$

15.

An object drops freely from a moving car is an example for-

a)

Circular motion

b)

Straight line

c)

Projectile Motion

d)

None of the above

16.

A body is projected horizontally from the top of a cliff with a velocity of 9.8 m/s. What time elapses before horizontal and vertical velocities become equal? Take g = 9.8 $ms^{-2}$

a)

9.8 s

b)

10 s

c)

1 s

d)

None of the above

17.

Find the magnitude of the centripetal acceleration of a particle on the tip of a fan blade, 0.30 metre in diameter, rotation at 1200 rev/minute,

a)

$40\ ms^{-2}$

b)

$245\ ms^{-2}$

c)

$20\ ms^{-2}$

d)

$4737.6\ ms^{-2}$

18.

What is the minimum number of coplanar vectors of different magnitudes which can give zero resultant?

a)

One

b)

Two

c)

Three

d)

Four

19.

$M^0L^0T^{-1}$ is the dimension of-

a)

Angular displacement

b)

Angular velocity

c)

Time period

d)

Frequency

20.

For circular motion , what is the angle between velocity and acceleration vectors?

a)

0°

b)

180°

c)

Between 0° and 180°

d)

90°

Unit Test class - 11

Total questions: 20

Worksheet time: 22mins

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