Question # 1

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

Which of the following is the only vector quantity

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Temperature

Energy

Power

Momentum

The dot product of two vectors is negative when

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They are parallel vectors

They are anti-parallel vectors

They are perpendicular vectors

None of the above is correct

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value the mass remaining constant?

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12

6

3

2

What will be the ratio of the distance moved by a freely falling body from rest in 4^th and 5^th seconds of journey?

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4 : 5

7 : 9

16 : 25

1 : 1

If a diamagnetic substance is brought near north or south pole of a bar magnet it is

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Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

Which of the following sources give discrete emission spectrum?

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Incandescent electric bulb

Sun

Mercury vapour lamp

Candle

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

According to Stoke's law drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

When we apply reverse bias to a junction diode it

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Lowers the potential barrier

Raises the potential barrier

Increase the majority carrier current

Decrease the majority carrier current

The structure of solids is investigated by using

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Cosmic Rays

X-rays

Intra red Radiation

y-rays

A force of 10N is acting along y-axis. Its component along x-axis is

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10N

20N

100N

Zero N

A wire of radius r has resistance R, It it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

A p-n junction has a thickness of the order of:

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1 cm

1 mm

10^-6cm

10^-12cm

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

When the length of a microscope tube increases, its magnifying power

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Decreases

Increases

May increases or decreases depending on the observer and the place of observation

Does not change

When the length of a microscope tube increase, its magnifying power

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Decreases

Increases

Does not Change

May increase or decrease depending on the observer and the place of observation

A fly is sitting on the objective of a telescope pointed towards the moon.

What effect is expected on the photography of the moon taken through the telescope?

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The entire of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

The percentage errors in the measurements of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed

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11%

8%

5%

1%

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