Question # 1

Which of the following is a characteristic of an ideal fluid?

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it is non-viscous

it is incompressible

it's motion is steady

all of the above

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The locus of all points in a medium having same phase of vibration is called

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Crest

Trough

Wavelength

Wave-front

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

The flux through a closed surface depends upon:

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Shape of geometry of the closed surface

Charge enclosed

Nature of the medium

Both (A) and (B)

Both (B) and (C)

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

The use of chips in electrons is described in the form of:

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Yellow boxes

Black boxes

Red boxes

White boxes

Orange boxes

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

2π radian is equal to the degrees

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180^o

90^o

360^o

None of these

The torque will be zero if the angle between r and F is

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zero

30°

45°

90°

In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is

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λ/2

λ

2λ

None

The rectangular components of force 5 dyne are

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3 and 4 dyne

2.5 and 25 dyne

1 and 2 dyne

2 and 3 dyne

The vertical component of velocity of a projectile during its motion is minimum

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at the time of projection

at the highest point

just before hitting the plane of projection

all of them

The dimensional formula for angular momentum is:

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(M°L²T^-2)

(ML²T^-1)

(MLT^-1)

(ML²T^-2)

The product of moment of inertia and angular velocity is called

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Angular momentum

Kinetic energy

Torque

Work

The fine rulings on a compact disc as a diffraction grating but each line is wide like

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0.01 μm

0.5 μm

0.05 μm

0.6 μm

The area of hysteresis loop is an indication of the

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Permeability of the material

Susceptibility of the material

Retentivity of the material

Energy dissipated per cycle

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

The magnitude of velocity at any instant is

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