Question # 1

The work required to lift a ball of mass 'm' from the surface of the earth to an infinite distance is

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Absolute P.E. of the body

P.E of the body

K.E. of the body

Chemical energy of the body

Though the wavelength of X-rays is smaller than that of visible light yet the speed of X-rays in vacuum is.

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longer that that of visible light

Smaller than that of visible light

Same as that of visible light

Unpredictable

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

In gases, the charge carriers are.

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Atoms

Molecules

Electrons only

Ions and electrons

An example of forced oscillation is

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the pendulum of a clock

The wind screen wiper

A plucked sonometer wire

A sonometer wire excited by a tuning fork

The sun appears elliptical before sunset due to

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Reflection

Refraction

Scattering

Total internal reflection

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

Which of the following is mechanical property of a material.

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Strength

Stiffness

Ductility

All of these

In what form is the energy stored in an inductor.

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Magnetic

electrostatic

Magnetic and electrostatic

All of the above

What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added.

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Increases

Decreases

Remains the same

Cannot be predicted

In which form energy is stored in acondenser.

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Electric energy

Potential energy

Kinetic energy

Magnetic energy

Why an even Carnot engine Carnot give 100% efficiency.

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We cannot find ideal sources

We cannot eliminate friction

We cannot reach absolute zero temperature

We cannot remove heat

Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.

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Archimede's principle.

Heisenberg uncertainty principle

Mosley's law

Schrodinger's wave equation

Which of the following quantities is zero about the centre of mass of body.

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Mass

acceleration

Moment

Angular acceleration

In a half wave rectifier the rms value of the A.C. component of the wave is.

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Less than D.C. value

Great her than D.C. value

Equal to D.C. value

Zero

Charge carriers in thermocouples are.

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Anions

Cations

Electrons

Protons

If an elevator is moving vertically up with an acceleration 'a' the force exerted on the floor by a passing of mass 'm' is

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Ma

Mg

M(g +a)

M (g-a)

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

If emf of the battery in a thermocouple is doubled, what is the rate of heat generation at one function.

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Remains unchanged

Becomes half

Become double

Becomes 4 times

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

The energy equivalent of 1 kg of matter a

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10^-15 J

1 J

10¹²J

10¹⁷ J

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

The reluctance of a body to start moving is called.

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Mass

Weight

Force

Inertia

Which term is used for human eye deflect near sightedness.

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Myopia

Hypermetropia

Presbyopia

Calaract

Such substance which undergo plastic deformation until they break are known as.

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Diatomic substances

Monoatomic substances

Ductile substances

Brittle substances

The combined effect of resistance and reactance's in A.C. circuit is called.

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Resistance

Conductance

Choke

Impedance

In case of a convex lens the rays closed to and parallel to the principal axis will converge after refraction by the lens at a point.

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Optical centre

Principal focus

Focal plane

Principal axis

A current carrying loop lying-in a magnetic field behaves lime a.

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Magnetics pole

Magnetic material

Magnetic dipole

Horse shoe magnet

A stone is whirled in a vertical circle at the and of a string when the stone is at the highest position, tension in the string is

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Maximum

Zero

Equal to weight of the stone

Less than weight of the stone.

The main advantage of step index fiber is.

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The size of the cable

The equality of the cbale

Difference in the wavelengths of signals

All of the above

A point mass moves through a circular arc of length 'l' and radius 'r' in time 't' what is the angular velocity about the centre of the circle.

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i/rt

r/it

2/rt

rt

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