Question # 1

What is the part of a simply D.C. motor that reverses the direction of current through the coil every half cycle.

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Armature

Brushes

Commutator

Slip rings

By definition a gas is said to be have undergone adiabatic compressing when

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No heat exchange occurs between the gas and its surroundings

The gas is compressed quickly

The gas is compressed slowly

The temperature of the gas remains constant

The escape velocity

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Increases with the increase of the mass of the body

Depends on the type of body used

Is independent of mass of the body

Decreases with the increases of the mass of the body

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

Which temperature is the absolute measure of temperature.

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Thermodynamic temperature

Freezing point

Boiling point

Absolute zero

The current passing across a p-n junction due to minority charge carriers is called

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Reverse current

Forward current

Leakage current

Both a and b

Two light waves which are not coherent cannot produce.

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Interference

Diffraction

Reflection

Dispersion

We can hear beats when the difference in the frequencies of two sounding bodies is not more than.

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2

4

6

10

The perpendicular distance between the line of action of forces and the axis of rotation

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Torque

Moment arm

Moment of force

Momentum

A bi convex lens of a material of refractive index 1.5 has the radius of curvature of each side equal to 50 cm the power of the lens will be.

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0.5 dipotre

1.0 dioptre

1.5 diopter

2.0dioptre

In which one of the following states molecules do net leavt their position.

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Solid

Liquid

Gas

Plasma

The internal resistance of a primary cell depends upon the.

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Current dawn form the cell

Concentration of the solution

distance between cell electrodes

All of the above

halls fall faster than rain drops due to their

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Grater size

Greater mass

Greater area

Structure

Light wave can be polarized because they

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Are transverse in nature

Can be reflected

Have short wavelength

Have high frequncies

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

Which italian inventor is credited with describing and sketching the first ideas for contact lens in 1508

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Galileo

Leonardo da vinci

roger Bacon

Hans Lipperahey

If the presence of air friction, the path of a projectile appears as.

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Straight line

Parabola

Hyperbola

zig zag

The are between the velocity time graph and the time axis is numerically equal to.

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Distance moved by the object

Speed of the object

Velocity of the object

Acceleration of the object

Radio carbon in the atmosphere is produced by the bombardment of.

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Oxygen by high energy neutrons

Oxygen by high energy protons

Nitrogen by high energy protons

Nitrogen by high energy neutrons

The unit of time constant RC is.

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Second

second-1

Second -2

Second 2

The loss of mass in a.m.u in a nuclear change can be calculated from energy involved in MeV by

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Dividing by 931

Multiplying by 931

Diving by 391

Multiplying by 391

In a stationary wave the particle velocity at the node is

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Zero

Constant

Minimum

Maximum

Good acoustic implies

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Obtaining as much reverberations as possible

Making the reverberation as small as possible

Obtaining the optimum of reverberations

Eliminating reverberations

A expression for total work done by the battery to move charge against an induced emf is equal to.

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W = LI2

W = 1/2 LI

W = 1/2 L3I

W = 1/2 LI2

Clouds are white because they efficiently scatter sunlight of all

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Colours

Wavelengths

Frequencies

Phases

The dioptre power of concave lens of 10 cm focal length is.

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0.1 dioptre

1.0 diopter

10 dioptre

-10 dioptre

The number of 0.0001 is abbreviated correctly by

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1 x 10⁴

10^-3

10^-4

0.1 x 10⁴

The magnitude of the instantaneous velocity is called the.

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_Displacement

Speed

Acceleration

Length

Length of second pendulum is

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98 cm

99 cm

99.2 cm

100 cm

A frictionless heat engine can be 100% efficient only if its exhaust temperature is

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Equal to the input temperature

Less than the input temperature

0 ^oC

0 K

The amount of charge which can be placed on a conductor does not depend on.

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The dielectric strength of the surrounding medium.

Its capacitance

Its potential

Its size or shape

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