Question # 1

Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of

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very small energy

very large energy

frictional forces

acceleration due to gravity

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

Which of the following diode is used for the detection of light

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photo diode

light emitting diode

photo voltaic cell

all of them

Centripetal acceleration is also called ________ acceleration

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Tangential

Radial

Angular

None of these

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

A uniform resistance wire of Length L and diameter d has a resistance R. Another wire of same material has length, 4L and diameter 2d, the resistance will be

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2 R

R

R/2

R/4

The photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

An average energy used by the car-from petrol in its life time

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1 × 10⁹ J

1 × 10¹⁰ J

1 × 10¹¹ J

1 × 10¹² J

In compound microscope image formed is

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Real erect and diminished

Virtual inverted magnitude

Real inverted and magnified

Virtual inverted and magnified

The discuss used by athletes has a mass of 1 kg, its weight in newtons is

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9.8 N

80 N

98 N

100 N

A cylinder cannot roll on

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A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

Electric intensity inside a hollow sphere is

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Minimum

Maximum

q / c_o

Zero

A simple astronomical telescope consists of

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Two convex lenses

Three convex and one cocave

Two concave lens

None of these

The magnifying power of a compound microscope can be increased if we use objective lens of

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Large focal length

Small focal length

Same focal length

None of these

The compound having highest %age of oxygen is:

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CH₃COOH

C₂H₅OH

H₂O

CH3COCH₃

The phenomenon is found to be prominent when size of the opening (aperture) is

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Grater than wavelength of light

Smaller than wavelength of light

Equal of light used

None of these

The minimum velocity necessary to put a satellite into the orbit is called critical velocity of the value

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6.7 kms^-1

7.9 kms^-1

8.1 kms^-1

9.1 kms^-1

The twinkling of stars is due to

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The fact that stars do not emit light continususly

The refractive index of the earth's atmosphere fluctuate

Intermittent absorption of star light by its own atmosphere

None of these

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