Question # 1

If the instantaneous velocity of a body does not change. the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

The state in which ice, water and vapour coexists in equilibrium is called

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zero degree celsius

zero degree fahrenheit

absolute zero

373 K

A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is

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0.15 x 10^-3Ns

0.98 x 10^-3Ns

1.5 x 10^-3Ns

2.5 x 10^-3Ns

The thermistors are usually made of

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Metals with low temperature coefficient of resistivity

Metals with high temperature coefficient of resistivity

Metal oxides with high temperature coefficient of resistivity

Semi conducting materials having low temperature coefficient of resistivity

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

The number of "Earth stations" which transmit signals to satellites and receive signals from them are:

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3

24

126

200

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

The resultant of two velocities 3 m/sec and 400 cm/sec making an angle 90° with each other is:

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20 m/sec

5 m/sec

3 m.sec

None of these

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinite work

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

The maximum distance of body from mean position when body is executing SHM is called

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Time period

Displacement

Amplitude

Frequency

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Which of the following can become a good permanent magnet

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iron

steel

both of them

none of them

Vibratory motion is always under

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Applied force

Restoring force

Periodic force

Gravitational force

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

Truth of kinetic energy is confirmed by:

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Diffusion of gases

Brownian motion

Both A and B

None of these

A virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The value of resistivity is the least for:

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Copper

Aluminimum

Silver

Tungsten

Iron

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

The waves which propagate out in the space due to oscillations of electric and magnetic fields are called:

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Mechanical waves

Electromagnetic waves

Matter waves

All of them

When the particles of the medium vibrate about their mean position, along the direction of the motion of waves, then the waves are called:

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Longitudinal waves

Transverse waves

Water waves

Complex waves

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Gamma rays consist of steam of

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electron

proton

photons

all of these

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