Question # 1

If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is.

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125 W

250 W

500 W

1,000 W

Cobalt -60 is a radioactive element with half life of 5.25 years. What fraction of the original sample will be left after 26 years.

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1/4

1/8

1/16

1/32

The angular momentum of a body about a fixed point is conserved if its velocity

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Decreases

Increases

Remain the same

Becomes zero

Which we double the voltage in a simple electric circuit, we double the

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Current

Power

Resistance

Both a and b

Which is not the strongest and the most familiar type of magnetism.

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Diamagnetism

Para magnetism

Ferromagnetism

All of these

Which vector can be used to locate the centre of mass of a collection of particles.

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Null vector

Unit vector

Position vector

Distance vector

The cloud chamber was invented by C.T.R. Wilson in

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1905

1907

1909

1911

For how long the sensation of sound persists in our brain.

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0.1 s

0.2 s

0.3 s

0.4 s

The image of an object 5 mm high is only 1 cm high. The magnification of the lens is

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0.2

0.5

1

2

If two non zero vectors are perpendicular to each other than their scalar product is equal to

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1

-1

0

infinity

The most common trivalent impurities are

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Boron , indium

Arsenic, indium

Arsenic, Antimony

Aluminium, Boron

The necessary condition for nuclear fusion is.

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High temperature and high pressure.

Low temperature and high pressure

Low temperature and low pressure

High temperature and low pressure.

What does the electricity meter record.

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Charge

Current

Energy

Power

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

Radioactive decay series can be represents on

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Smith chart

Segre chart

Logarithmic chart

Carbon paper

Fluid mechanics is the study of how fluid move and the other ting involved is

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Energy

Velocity

Forces

Position

The constant lamda is called the.

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Decay constant

Gas constant

Planck's constant

Dose constant

An object travels at constant speed around a circle of radius 1.0 m in 1.0 s the magnitude of its acceleration is.

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zero

1.0 m s-2

2 m s-2

4 pi2 m s-2

Why FET amplifiers are called voltage controlled devices.

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Input is a current signal

Output is a current signal

Input is a voltage signal

Output is a voltage signal

What is true is real images formed by a converging lens.

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they are inverted

They are on the same side of the lens as the object

They can never be shown on a screen

They cannot be seen

A body of mass 8 kg moves along a circle of radius 4 m with constant speed of 88 m s-1 The centripetal force on the body is.

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10 N

128 N

48 N

148 N

The SI unit of torque.

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kg m2

kg ms-2

kg m2 s-2

kg ms -1

In any fluid the effect of decrease in pressure with the increase in speed in a horizontal pipe is known as

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Bernoulli's effect

Venturi effect

Torriculli's effect

Shift effect

The force that bonds protons and neutrons together int he nucleus despite the electrical repulsion of the protons is called.

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Molecular force

Nuclear force

Atomic force

Gravitational force

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

When ever current is drawn from a cell Its terminal potential difference and emf become

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Different

Same

Zero

Negative

In the experiment of force on a current carrying conductor in a uniform magnetic field the magnitude of force depends upon which factor.

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Force is inversely proportional to current

Force is directly proportional to current

Force is inversely proportional to voltage

Force is directly proportional to voltage

If a charged body is moved against the electric field it will gain.

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P.E

K.E.

Electrical P.E.

Gravitational energy

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

The dimensions of work are

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[MLT-2]

[ML2T-2]

[ML2T-1]

[MLT-1]

Which of the following particles leave no trail in a cloud chamber.

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Electrons

Protons

Alpha particles

Neutrons

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