Question # 1

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Real gases strictly obey gas law at:

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High pressure and low temperatures

Low pressures and high temperatures

High pressures and high temperatures

None of these

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

Specific resistance of a wire depends upon

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Length

Cross-section area

Mass

None

Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves?

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100 ms^-1

200 ms^-1

450 ms^-1

900 ms^-1

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

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Crest

Trough

Wavelength

Wave-front

The damping depends upon the

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amplitude

sharpness

both of them

none of them

Branch of physics which deals with the study of stars and galaxies is called:

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Solid state physics

Astrophysics

Molecular physics

Chemical physics

The voltage increases linearly with

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time

velocity

acceleration

torque

The discuss used by athlete has a mass of 1 kg, its weight in newton is

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9.8 N

80 N

98 N

100 N

Young's modulus for brass is

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40

60

90

91

The principle of rocket motion is based on the

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First law of motion

Second law of motion

Third law of motion

None of these

If force of friction is negligible, then acceleration of two free falling objects of different masses is

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The same

Different

Smaller mass has smaller acceleration

None of these

SI unit of work is

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N-m

N-m²

N-ms^-1

N-ms^-2

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

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115 m

1.15 m

11.5 m

0.115 m

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

The ultra-purity of optical fibre is

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90 %

99 %

99.9 %

99.99 %

A body of mass m is falling downward in a viscous medium with terminal velocity v net force on the body is

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mg

mg-6πηrv

6πηrv-mg

Zero

Can the magnitude of a vector have a negative value ?

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No

Yes

yes in same cases

None of these

Polymers have naturally combinations like with

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Oxygen

Sulphuric

Hydrocarbons

Oxygen and carbons

The distance between two concentric wave fronts is

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A wave length

A half wavelength

Zero

None of these

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