Question # 1

Give the number of factors which affect the ability of a capacitor to store charge.

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2

3

4

5

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

Positive charge can be produced by:

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Combing in hair

Rubbing glass rod on silk

By rubbing ebonite rod on wool

By rubbing glass rod wool

The ratio of image height to object height is called:

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Linear magnification

Power

Refraction

Radius of curative

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:

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5.0 cm

7.5 cm

15 cm

20 cm

Which particles are nucleons?

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Electrons and protons

Protons and neutrons

Electrons and neutrons

Electrons and positrons

Radiations present in atmosphere due to the presence of different radioactive elements are:

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Cosmic radiations

Background radiations

secondary radiations

Electromagnetic radiations

The output of a two input NOR gate is 1 when:

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A is 1 and B is 0

A is 0 and B is 1

Both a and b are 0

Both a and b are 1

After refraction from a convex lens, rays of light parallel to the principal axis converge at a point, this point of convex lens is called:

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Principal focus

Pole

Focal length

Optical center

An object of placed at he centre of curvature of a concave mirror. The image produced by the mirror is located:

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out beyond the centre of curvature.

at the centre of curvature

between the centre of curvature and the focal point

at the focal point

We can distinguish between the notes of a piano and flute due to ………… of sound.

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Loudness

Pitch

Quality

Intensity

Coulomb's law is mathematically stated as:

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F = k q1 q2/r3

F = k q2 q2 / r2

F = k q1 q2 / r

F = k q1 q2 / r2

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