Question # 1

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

Glycerin has viscosity _____ the viscosity of water:

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More than

Equal to

Less than

None of these

Which one of the following can act approximately as a source of monochromatic light;

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Neon lamp

Fluorescent tube

Sodium lamp

None of these

The only significant motion possessed by the mono-atomic gas represented is:

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Translatory

Rotatory

Vibratory

None of these

Which one of the following is dimensionless:

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Acceleration

Velocity

Density

Angle

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

SI unit of frequency is

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second

hertz

revolution

vibrations/sec

Angular momentum

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Scalar

Axial vector

Polar vector

At 45° angle

A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is

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17 m/s

33 m/s

17.5 m/s

none

The units of modulus of elasticity are

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Nm^-2

Nm

ms^-1

Pascal

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is:

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Radius of the circle

Twice the radius

Thrice the radius

None of these

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

Bodies which falls freely under gravity provides good example of motion under:

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Uniform acceleration

Non-uniform acceleration

Uniform velocity

None of these

The first series which was identified in the spectrum of hydrogen is called:

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Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

There are some whose resistivity becomes zero below a certain temperature, called

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absolute zero

0°C

critical temperature

lower fixed point

The instantaneous velocity of a body moving along a circle is directed

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along the radius

along the tangent

away from the circle

none of them

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

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Wien's constant

Stefen's constnat

Planck's constant

Boltzmann's constant

None of these

Fluids resist force, This property is called

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Stiffness

Strength

Ductility

Elasticity

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

Which of the following is the longitudinal waves?

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Sound waves

Waves on plucked string

Water waves

Light waves

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

The SI unit of spring constant is identical with that of

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Force

Surface tension

Pressure

Loudness

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

Slope of velocity-time graph represents:

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Acceleration

Speed

Torque

Work

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

Where the streamlines are very close to each other, the pressure will be

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low

zero

high

all of them

The dimension of linear inertia is:

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MLT²

ML⁰T^-2

ML⁰T⁰

MLT^-1

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