Question # 1

Who discovered a phenomenon of thermos electricity.

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Peltier

Joule

Seeback

thomson

The special theory of relativity was presented in .

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1905

1909

1911

1919

The nib of fountain pan is split of convey ink down the nib by the phenomenon of.

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Adhesion

Cohesion

Osmosis

Capillary

If length of second pendulum becomes four times than its time period will become

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Two times

Four times

Six times

Eight times

With increase in temperature the angle of contact of liquid.

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Increases

Decreases

Becomes zero

First increase then decreases

Wave motion in air consist of

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Longitudinal waves

Transverse waves

Seismic waves

Polarized waves

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 cm s-1

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

In general work done on or by a gas depends on.

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The initial state only

The final state only

The initial and final states

The initial state the final state and the path

Materials that experience a force from stronger to weaker regions of magnetic field are called.

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Non magnetic

Paramagnetic

Ferromagnetic

Diamagnetic

Which of the following scientists is known for his exceptional work in the field of optics.

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Albert Einstein

Issac Newton

Ibn al Haithem

Alberuni

What is the focal length of a normal eye lens.

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1 mm

2 cm

25 cm

1 m

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

In an A.C. circuit the current.

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Is in phase with voltage

Leads the voltage

Lags the voltage

Any of these depending upon the circumstances

When temperature increases, frequency of an organ pipe

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Decreases

Increases

Remain the same

Become zero

When a hot liquid is mixed with a cold liquid temperature of the mixture.

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First decreases and then becomes constant

First increases and then becomes constant

Continuously decreaes

Is undefined for some time and then nearly becomes constant

As the mass number varies, which of the quantities does not change w.r.t nucleus.

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Mass

Volume

Binding energy

Density

If volume of the gas doubled without changing its temperature the pressure of the gas is

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Reduced to half of original value

Not changed

Reduced to one fourth of original value

Doubled

a cube with sides 2 cm long is made from a material of density 8 g cm-3 What is the mass of the code

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4 g

16 g

32 g

64 g

The distance between the optical centre and principal focus is

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Focal plane

Focal length

Optical centre

Principal axis

The point of which the whole weight of the body acts

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zero point

Centre of mass

Centre of gravity

Equilibrium

In a photocell, certain metals emit electrons for

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Visible light

X-rays

Infrared light

Ultraviolet light

The amplitude of sound wave determines its

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Pitch

Loudness

Reverberation

Interference

Which law states that magnetization is inversely proportional to temperature for a fixed value fo the field.

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Curie's law

Voltmeter

Ammeter

Wattmeter

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

The emission of electrons from a metal surface when exposed to light of suitable frequency is called.

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Pair production

Compton effect

Photo electric effect

Zeeman effect

When the source and observer are moving away from each other the apparent pitch will

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Increases

Decreases

Be zero

Be infinite

If the resultant of two forces, each of magnitude F have the magnitude F, angle between the forces will be.

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30^o

80^o

90 ^o

120 ^o

The susceptibility of a paramagnetic material is

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negative

Positive

Zero

Infinity

Parallel rays of light are focused by a thin convex lens.A thin concave lens of the name focal length is then joinjed to the convex lens The focal point will.

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Shift to infinity

shift towards the lens by a small distance

shift away from he lens by a small distance

Remain at its original position

The surface of a liquid is somewhat similar to a stretched membrane because.

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There is an elastic stress in the surface

Tension in the surface increases if the area is increased

The surface has a natural tendency to contract

Ripples can be produced on the surface

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