Question # 1

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

If a mass of 10 gm is suspended from a spring of k = 9.8 Nm^-1, then the extension will be:

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1 cm

1 m

10 mm

None of these

Efficiency of carnot engine is independent of the

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temperature of sink

temperature of source

nature of the working substances

none of them

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

If the velocity time graph is a straight line parallel to time-axis, then it means that:

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The body is moving with uniform velocity

The body is moving with uniform acceleration

The body is at rest

None of above

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

When a body moves with a constant speed in a circle:

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No work is done on it

No acceleration is produced in the body

Velocity remains constant

None of these

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

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Power

Work

Pressure

None of these

When quarter of a circle is completed, phase of vibration is:

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90°

180°

45°

360°

A point on the surface of the mirror where principle axis meets is called

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Focus

Centre of curvature

Pole

Aperture

A diffraction grating contains 5000 lines per centimeter, its grating element will be

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1 x 10^-4nm

1 x 10^-14m

1 x 10^-14cm

1 x 10^-4cm

At the maximum height the V_fis

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Constant

Zero

Maximum

None of these

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

The renewable energy source is a biomass which is a

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Rare source

Unlimited source

Potential source

None of these

The angle between A and B is θ.The value of the triple product A,(B x A) is:

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A²B

Zero

A²B sin θ

A²B Cos θ

The unit of torr or mm of Hg is opted instead of SI unit of pressure because

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Measurement is easy

Swift calculations

Extensive use in medical equipments

None of these

The physical sciences deals with

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Living things

Non-living things

Both

None of these

Displacement is a physical quantity, which is a

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Scalar

Vector

Variable quality

None of these

A hollow metal sphere of radius 5 cm is change such that the potential on its surface 10 V. the potential at the centre of the sphere is

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Zero

10 volts

The same as that at a point 5 cm away from the surface

The same as that a at point 25 cm away from the surface

A motorcycle driver double its velocity when he is having a turn.The force exerted outwardly will by

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Double

Half

4 times

1/4 time

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