Question 1

Choose the correct statement with respect to force.

Accepted Answer

1gf x cm =980 dyne cm

Answer

The turning effect on a body by a force depends on momentum of force

Answer

1kgf x m=10⁷ dyne cm

Answer

The CS unit of momentum of force is Newton x meter

Question 2

Which of the following is not the example of couple force?

Accepted Answer

Tuning the toothed wheel of a bicycle

Answer

Turning a water tap

Answer

tightening the cap

Answer

Turning a steering wheel

Question 3

Choose the incorrect statement.

Accepted Answer

The tension in a string attained with a stone which is whirled in circular path provides the equilibrium force

Answer

The algebraic sum of moments of all the forces acting on the body about the point of rotation should be zero

Answer

In equilibrium condition the resultant of all the forces acting on the body should be equal to zero.

Answer

The rain drop reaches the earth surface with constant velocity

Question 4

Refractive index of diamond with respect to air is 2.4 and speed of light in vacuum is 3 x10⁸ ms^-1. Hence speed of light in diamond is

Accepted Answer

1.25 x 10⁸ ms^-1

Answer

2.5 x 10⁸ ms^-1

Answer

2.25 x 10⁸ ms^-1

Answer

1.5 x 10⁸ ms^-1

Question 5

For the arrangement shown answer the following question. Moment of force at point A

Accepted Answer

10 Nm

Answer

20 Nm

Answer

5 Nm

Answer

0.4 Nm

Question 6

For the arrangement shown answer the following question. Moment of force at point B

Accepted Answer

15 Nm

Answer

20 Nm

Answer

0.4 Nm

Answer

50 Nm

Question 7

For the arrangement shown answer the following question. Total momentum of force

Accepted Answer

25 Nm

Answer

20.6 Nm

Answer

20 Nm

Answer

10.6 Nm

Question 8

For the arrangement shown answer the following question. Moment of force at point A if OA= 3m:

Accepted Answer

12 N-m

Answer

20 N-m

Answer

5 N-m

Answer

10 N-m

Question 9

Work (W), Force (F) and displacement (S) are related to each other by

Accepted Answer

W= F S $\cos heta$

Answer

S= W F $\cos heta$

Answer

F= W S $\cos heta$

Answer

S= W F $\cos heta$

Question 10

Force is positive when

Accepted Answer

Displacement and force are in same direction

Answer

When $\cos heta$ =90°

Answer

When $\cos heta$ =180°

Answer

When displacement and force are in opposite direction

Question 11

Hari lift a bag and reach to the station in 1 min while Shyam lift the bag (with same weight) and reach to station in 2 min. If the distance travelled by both of them are same, which of the following statements are false,

Accepted Answer

Work done by both of them is different

Answer

Power spent by Hari is twice than Shyamn

Answer

Work done by both of them is same

Answer

Power spent by Shyam is half than Hari

Question 12

The value of 1 Wh in kJ is:

Accepted Answer

3.6 kJ

Answer

0.36kJ

Answer

360 kJ

Answer

36 k

Question 13

Relation between velocity ratio (V.R.), a velocity of load (V_L) and velocity of effort (V_E) is.

Accepted Answer

V.R.= V_E/ V_L

Answer

V.R.= V_Lx V_E

Answer

V.R.= V_L/ V_E

Answer

V.R.= V_Ex V_L

Question 14

The mechanical advantage (M.A.) is defined as:

Accepted Answer

L/E

Answer

L-E

Answer

E/L

Answer

L+E

Question 15

The mechanical advantage (M.A.) is defined as:

Accepted Answer

L/E

Answer

L-E

Answer

L+E

Answer

E/L

Question 16

A stone is thrown in air in vertically upward direction with velocity 30 m/sec. If the mass of the stone is 10g then step to find initial KE applied to stone

Accepted Answer

Energy = (1/2)mv²= (1/2) x (0.01) x (30x30)

Answer

Energy = mv²= 10g x (30 x 30)

Answer

Energy = (1/2)mv²= (1/2) 10g x (30x30)

Answer

Energy = mv²= (0.01) x (30x30)

Question 17

A stone is thrown in air in vertically upward direction with velocity 30 m/sec. If the mass of the stone is 10g then Maximum height that this stone can achieve (air friction is neglected)

Accepted Answer

45m

Answer

40m

Answer

30m

Answer

35m

Question 18

A stone is thrown in air in vertically upward direction with velocity 30 m/sec. The mass of the stone is 10g. If 60% of initial energy is lost on reaching to maximum height due to air friction, the maximum height will be

Accepted Answer

18m

Answer

14m

Answer

20m

Answer

10m

Question 19

Potential energy can be expressed as.

Accepted Answer

U = mgh

Answer

K = (1/2) mv²

Answer

P = ma

Answer

V = $\cos heta$

Question 20

Choose the incorrect statement about light wave:

Accepted Answer

The wavelength of light waves is of the order of 10^-6 m.

Answer

speed of light waves is 3 x 10⁸m/sec

Answer

Light waves are transverse wave

Answer

light waves are electromagnetic waves.

Question 21

Choose the incorrect statement about ultrasonic wave:

Accepted Answer

It can be absorbed easily in a medium

Answer

Frequency of ultrasonic wave is 20 KHz.

Answer

It can travel un-deviated through a long distance.

Answer

It can be confined to a narrow beam

Question 22

Velocity of the wave is 50 m/sec. Then Frequency of the wave is around:

Accepted Answer

12 Hz

Answer

2 Hz

Answer

50Hz

Answer

60 Hz

Question 23

A gun is fired in front of a vertical cliff. The echo of that fire is heard after 5 sec. The gun is again fired on moving towards the cliff 98 m and the echo is again heard in 2 sec. The distance from which the gun was fired in starting

Accepted Answer

163 m

Answer

63 m

Answer

62 m

Answer

14m

Question 24

Snell's law is used for:

Accepted Answer

Refraction

Answer

none of these

Answer

Absorption

Answer

Reflection

Question 25

The diagram shows a spherical lens in which the brightest image obtained is at a distance of 20 cm. The spherical lens used is

Accepted Answer

convex

Answer

convexo concave

Answer

plano convex

Answer

concave

Question 26

The diagram shows a spherical lens in which the brightest image obtained is at a distance of 20 cm. The focal length of lens is

Accepted Answer

20 cm

Answer

0.25 m

Answer

30 cm

Answer

100 cm

Question 27

The diagram shows a spherical lens in which the brightest image obtained is at a distance of 20 cm.

If the object is placed at a distance of 100 cm in front of the lens then, the screen should placed at a distance of ............. to obtain a clear image

Accepted Answer

25 cm

Answer

6.25 cm

Answer

12.5 cm

Answer

15 cm

Question 28

The diagram shows a spherical lens in which the brightest image obtained is at a distance of 20 cm. The power of the above lens is

Accepted Answer

5 D

Answer

+7.67 D

Answer

- 6.67D

Answer

+5.67 D

Question 29

The light is passing from one transparent medium to another transparent medium having different optical density: The phenomenon is

Accepted Answer

Refraction

Answer

Absorption

Answer

bending

Answer

Reflection

Question 30

Light is traveling from denser to rarer medium then

Accepted Answer

Its wavelength will increase, velocity increases

Answer

the light will not be able to pass, velocity remains same

Answer

It's wavelength will decrease, velocity increases

Answer

No change in wavelength, No change in velocity

Question 31

Wavelength range of yellow light is

Accepted Answer

5780 A⁰-5920A⁰

Answer

4000A⁰-4460A⁰

Answer

6000A⁰- 8000A⁰

Answer

4640A⁰-5000A⁰

Question 32

Choose the incorrect statement

Accepted Answer

The prism produce colours

Answer

Dispersion of white light occurs al the first surface of prism

Answer

Deviation of light occurs at both the surface of prism

Answer

The prism splits the various colours present in the light incident on it.

Question 33

Choose the correct statement

Accepted Answer

EM waves are transverse wave

Answer

EM waves requires a material medium for propagation

Answer

The velocity of EM waves not changes when medium changes

Answer

EM waves reflects by Electric & Magnetic field

Question 34

Choose the correct statement with respect to lateral displacement

Accepted Answer

Both 1 and 3

Answer

2. It occurs when ray passes through two optical media

Answer

1. It occurs in case of a rectangular glass slab

Answer

3. It is directly proportional to thickness of glass slab

Question 35

Choose incorrect statement about concave lens

Accepted Answer

The image is always real

Answer

The image is always erect

Answer

The image is always diminished

Answer

The image is always virtual

Question 36

Choose the correct formula for magnifying power of lens

Accepted Answer

m = 1 + ( D/f)

Answer

m = (D/f) + 2

Answer

m = 1 + ( f/D)

Answer

m =  D/f

Question 37

Choose the incorrect statement

Accepted Answer

The size of reflector should be small enough as compared to wavelength of the sound

Answer

To hear the echo distinctly the reflecting surface in air should be at minimum 17m distance.

Answer

time taken to hear echo is (2d/v)

Answer

An echo is heard only if the distance of person producing sound is long enough to allow the reflected sound to reach a person at least 0.1 sec after original sound is heard

Question 38

Choose incorrect statement

Accepted Answer

Infrasonic waves are audible for human ears.

Answer

Range of audibility is 20 Hz to 20,000 Hz

Answer

the sound of frequency greater than audibility range is called ultrasonic

Answer

Sound wave require medium to propagate

Question 39

The relationship to evaluate the efficiency is

Accepted Answer

power output/power input

Answer

power input x power output

Answer

power output x power input

Answer

power input/power output

Question 40

In linear motion the acceleration is

Accepted Answer

Zero

Answer

Positive

Answer

Constant

Answer

Negative

Question 41

The moment of force is equal to

Accepted Answer

Product of force & perpendicular distance

Answer

Product of force & mass

Answer

Product of force & acceleration.

Answer

Product of mass & acceleration

Question 42

The formula of current is

Accepted Answer

I = Q/t

Answer

I = t/ Q

Answer

t=IQ

Answer

Q = I/t

Question 43

one coulomb is equals to

Accepted Answer

charge in 6.25×10^18 electrons

Answer

charge in 6.25×10^18 proton

Answer

6.25×10^18 beta ray

Answer

6.25X10^18 alpha ray

Question 44

To measure potential difference voltmeter is always connected in

Accepted Answer

parallel

Answer

both (a) & (b)

Answer

None of these

Answer

Series

Question 45

Ohm’s law is obeyed only when temperature of conductor remains

Accepted Answer

constant

Answer

increase

Answer

None of these

Answer

decrease

Question 46

The resistance of conductor do not depend on

Accepted Answer

humidity of conductor

Answer

temperature of conductor

Answer

Length of conductor

Answer

material of conductor

Question 47

The specific resistance is very high for

Accepted Answer

insulator

Answer

metal

Answer

semiconductor

Answer

alloys

Question 48

When light travel from air to glass it

Accepted Answer

bend towards the normal

Answer

does not bend

Answer

bend away from normal

Answer

none of these

Question 49

The correct relationship between refractive index and speed of light is

Accepted Answer

u=c/v

Answer

u=v×c

Answer

u=v+c

Answer

u = v/c

Question 50

The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33, 1.47 respectively. In which of these material light travel faster?

Accepted Answer

water

Answer

Turpentine oil

Answer

Equal in all

Answer

Kerosene oil

Question 51

the angle of deviation does not depend on

Accepted Answer

size of prism

Answer

colour of light

Answer

angle of prism

Answer

angle of incidence

Related quizzes

Related quizzes