Question # 1

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

The relation between the charge Q of a parallel plate capacitor and the P.D between its plates is

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Q=V/C

Q=C/V

Q=1/2CV

Q=CV

In a capacitive circuit

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Current leads voltage by phase ofπ/2

Voltage leads current by phase ofπ/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

In all natural processes where heat flows from one system to another, there is always a net

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decrease in entropy

increase in entropy

decrease or increase in entropy

none of them

All trigonometric functions (since, cosine tangent etc. ) are positive in:

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1st Quadrant

2nd Quadrant

3rd Quadrant

4th Quadrant

Conventional the angular Velocity is Directed at an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of above

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

The quantity have dimension of ML²T⁰²will have SI unit of:

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Watt

Newton

Joule

Metre

For the virtual image, option _______ is not correct:

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1/p = 1/f -1/q

1/f = 1/p -1/q

1/p=1/p-1/f

1/p=1/f+1/q

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

All changes which occur suddenly are irreversible through

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Conduction

Convection

Radiation

All of these

The apparent size of an object depends on the angle subtended but it at the eye. As the angle increases the size of the object

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Smaller

Larger

Very large

None of these

Which part of the spectrum is most visible?

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Red

Violet

Yellow

Yellow-green

Zero order image formed by the grating when the angle the along the direction of normal to grating is

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Zero

90^o

180^o

None of these

For full wave rectification, the minimum number of diodes used is:

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1

2

3

4

According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

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Base

Source

Producer

Origin

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

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%

Spherical aberration can be reduced by using

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Convex lens

All the portions of the lens

Central portion of the lens

Upper portion of the lens

If water rises 4 cm in a long thin tube because of capillary action then under corresponding conditions of use.the rise (in the tube) of a liquid whose density is 2 g/cm³ will be

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1 cm

2 cm

8 cm

None

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