Question # 1

A hole in p-type my be due to:

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Trivalent impurity

Breking of some covalent bond

Pentavalent impurity

Germanium

Either (A) or (B)

Which one is the least multiple:

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Pico

Femto

Nano

Atto

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

When a shall explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

Field lines are closer to each other in the region where the field is:

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Stronger

Weaker

Much weaker

Absent

None of these

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

Two forces each of the magnitude F act perpendicular to each other. The angle made by the resultant force with the horizontal will be:

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30°

45°

60°

90°

A stone is dropped from rest from the top of a tower 19.6m high.The distance traveled during the last second of its fall is (giving g = 9.8 m/s²)

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9.8 m

14.7 m

4.9 m

19.6 m

An image formed by a concave lens is always

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Virtual

Real

Inverted

None of these

Gauss s law in electrostatics is true when the charges enclosed in Gaussian surface are

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Stationary only

Moving only

Moving or stationary

None of these

If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by blue light of the same intensity:

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Fringe width will decrease

Fringe width will increase

Fringe width will remain unchanged

Fringe will become less intense

A beam of light enters air from water.Which of the following characteristics of light will not change in water

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Frequency

Wavelength

Velocity

Amplitude

A double convex lens acts as a diverging lens when the object is

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Between f and 2f

At the foucs

Inside the focus

All of these

Two small spheres of radii r and 2r fall through a viscous medium with constant speed the viscous forces experienced by them are in ratio

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1 : 2

2 : 1

1 : 4

4 : 1

In a experiment to determine acceleration due to gravity by simple pendulum a student commits 1 % positive error in the measurement of length and 3 % negative error in the measurement of time period The percentage error in the values of g will be

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7%

10%

4%

3%

Two forces P and Q have a resultant Perpendicular to P.the angle between the forces is:

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tan^-1 (-P/Q)

tan^-1(P/Q)

sin^-1(P/Q)

cos^-1 (-P/Q)

An electric field lines provides the information about

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Electric force

Direction

Medium

All of them

The unit cell of the shape of match box is called

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Cubic

Tetragonal

Orthorhombic

Rhomboheral

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