Question # 1

The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at

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100 K

273 K

0 K

-273 K

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

During the negative half-cycle of the half-wave rectification, the diode

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does not conduct

conducts

either of these

none of these

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

The pattern of NaCl particles have a shape which is :

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Cubic

Body centred cubic

Simple cubic

face centred

Both (A) and (C)

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

The phase determines the

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displacement

amplitude

frequency

state of motion of vibrating body

What are the SI base units of the coefficient of viscosity

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Kg m s^-2

kgm² s^-2

Kg m s^-1

kg m^-1s^-1

When quarter of a circle is completed, the phase of vibration is:

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90°

180°

45°

360°

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

If the angle of refraction is 90^o, for which the angle of incidence is called

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Incident angle

Critical angle

Angle of emergence

None of these

The two thin tubes which show most correctly the behavior of water are

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1 and 2

2 and 3

3 and 4

4 and 5

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

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Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

The dimensional formula of torque is:

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[ML²T^-2]

[MLT^-2]

[ML^-1T²]

[ML^-2T^-2]

Torque is defined as:

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Time rate of change of angular momentum

Time rate of change of linear momentum

Time rat of change of angular veloctiy

All of these

Dimensions of impulse are similar to the dimensions of

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torque

work

force

momentum

In case when there is no total displacement and average velocity, then the motion is described by

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Variable velocity

Instantaneous velocity

Initial velocity

None of these

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

The central point in the Newton's rings is dark due to

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Destructive interference

Constructive interference

Additional of path difference λ/2

b and c

The optical fibre is covered for protection with

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rubber jacket

plastic jacket

steel jacket

copper jacket

A force of 10N is required to move a body with a velocity 10 ms^-1the power developed is

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10 W

50 W

100 W

1000 W

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