Question # 1

The phase at the positive peak is

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Π/2

Π

3Π/2

2Π

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

When an electron enters in a magnetic field right angle to its motion, the magnitude of its velocity will be

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changed

zero

unchanged

none of these

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

The unit of viscosity is SI system is:

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Kg^-1m sec^-1

Kgm^-1 sec^-1

Kg^-1m^-1 sec

None of these

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

The value of current at resonance in series LCR circuit is affected by the value

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R only

C only

L only

R, C and L

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

The force exerted by the fluid in a hydraulic pump on the piston is 2000 N.If the area of the piston is 10 cm² the fluid pressure on the piston is in N/cm²

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20

200

2000

20000

The superposition of the two waves of same frequency and amplitude travelling in the same direction gives rise to an effect called:

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Diffraction

Interference

Polarization

Dispersion

The expression for the terminal velocity V_t when mass of the droplet is considered is

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V^t = 2grρ/9η

Vt = 4grρ/9η

V_t = 4gr²ρ/9η

V_t = 4gr³ρ/9η

A body of mass 10 kg is dropped to the ground from a height of 10 meters.The work done by the gravitational force is (g = 9.8 m/s²)

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-490 Joules

+ 490 Joules

- 980 Joules

+ 980 Joules

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tension

The numerical ratio of velocity to speed is

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Less than 1

Less than zero

Greater than 1

Either less than or equal to one

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

Steel is preferred for making permanent magnets because it has

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Large retentivity and large coercively

Small retentively and small coercively

Large retentively and small soercively

Small retentively and large coactivity

Which of the following quantities is / are scalar ?

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Dipole moment

Electrical permitivity

Electric field

Electrical potential

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

Human body is composed of particles to produce electric force are

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Atoms

Molecules

Charges

All of them

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