Question # 1

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

Which given element has lowest work function

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Na

Al

si

C

For an electron or position the rest mass energy is equal to.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

Which of the following quantity is zero about the centre of mass of baody.

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Mass

Acceleration

Moment

Angular momentum

The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called.

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Reluctance

Impedance

Reactance

Resistance

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

When 5 C of charge flows through a particular resistor 10 J of energy is converted What is the p.d. across the resistor.

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0.5 V

2.0 V

15 V

50 V

Which of the following is an electrical insulator that can be polarized by an applied electric field.

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Conductor

Condenser

Di electric

Capacitor

Which type of microscope was the first to be developed.

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Optical microscope

Digital microscope

Electron microscope

All were developed at the same time

Mean free path of gas molecules is inversely proportional to its

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Volume

Pressure

Temperature

Size

A type of resistor whose resistance varies significantly with temperature is.

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Thermistor

Thermocouple

Strain gauge

Potentiometer

A diver leaving the diving board makes a somer sault in the air.

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This is due to gravitational force

The moment of inertia is decreased during the turn

His moment of inertia is increased

He pushes at the air for making the true

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

The cause of production of eddy current is the

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Current flowing in a conductor

Current flowing in a insulator

Motion of a conductor in a varying magnetic field

Motion of an insulator in a varying magnetic field

What happens to a soap bubble, when some charge is given to it.

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It collapses

It increases in size

It decreases in size

It feels nothing

Which of the following is invariant under Galilean transformation.

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Velocity

Impulse

Momentum

Distance

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

Which one of the following pairs does not have the same dimensions.

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Force and weigfht

Pressure and stress

Capacitance and resistance

Energy and work

The induced current in a circuit can be increased by

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of the above

The process where by energy is dissipated from the oscillating system is called.

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Resonance

Damping

Forced oscillation

Free oscillation

The discovery of interference of light was made possible in.

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1801

1901

1825

1925

Two waves of the same frequency and amplitude travelling in opposites directions along the same path in the same medium produce.

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Stationary waves

Transverse wave

Longitudinal waves

Compressional waves

The basic quantity used to describe the state of magnetization of a substance is the

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Magnetic strength

Magnetic susceptibility

Magnetic moment

Magnetic moment per unit volume

In vacuum all electromagnetic waves have the same.

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Frequency

Amplitude

Speed

Wavelength

A bat while flying determines the location and nature of object in his way by sending.

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Infrasonic waves

Ultrasonic waves

Supersonic waves

Ultraviolet waves

The corss product of two vectors is zero when they

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Are parallel to each other

Are perpendicular to each other

Are at an angle of 120 ^o

Both are equal

What are isotopes.

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Atoms of the same element with different numbers of neutrons.

Atoms of the same element with different numbers of protons.

Atoms which are radioactive

Atoms which have gained or lost an electron

If two gases have same reduced pressure volume and temperature it is according to

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Boyle's law

Charles law

Law of corresponding state

Zeroth law

The image of distant object as seen through as astronomical telescope is.

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Real and inverted

Virtual and inverted

Real and erect

Virtual and erect

When a ray of light enters a glass slab from air

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Its frequency increases

Its wavelength increases

Neither frequency nor wavelength change

Its wavelength decreases

The critical angle will be maximum when light travels from

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Glass of air

Water to air

Water to glass

Glass to water

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