Question # 1

A solenoid is a coil of wire which is:

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Short, loosely wound, cylindrical

Long, tightly wound, spherical

Long, loosely wound, cylindrical

Long, tightly wound, cylindrical

None of these

The working of galvanometer depends upon torque exerted on a current carrying coil in

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magnetic field

electric field

gravitational field

nuclear field

The system international (SI) is built from _______ kind of unites

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Two

Three

Four

Five

Certain charge +q is placed at the center of a sphere. At each of the sphere,The directions of electric intensity and vector area are:

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Same

Different

Opposite to each other

At 60º with each other

Both (B) and (C)

The e/m of an electron moving in a circular path in a magnetic field is equal to

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V/Br

V/B²r²

V²/Br²

V²/Br

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

A spring of constant k = 0.4 N m^-1_{is to be extended thorugh 10 cm at a place where g = 10 m sec}^-2. The mass to be suspended should be:

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4 gms

0.4 gms

40 gms

None of these

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

Which is modified form of galvanometer

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potentiometer

battery

voltmeter

slide wire bridge

The relation between Boltzmann's constant K, gas constant R and Avogadro's number is N_Ais

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K = N_A/R

K = RN_A

K = R/N_A

K = PV/NT

When a silicon crystal is doped with a trivalent element, then the atom of the trivalent element is known as

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acceptor

donor

either of them

none of them

In thin film colours are due to

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Reflection

Interference

Diffraction

Refraction

If A x B = B x A,then the angle between A and B is

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π

π/3

π/2

π/4

The time rate of change of displacement is called

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Speed

Velocity

Acceleration

None of these

A lift os descending at a constant speed V. A passenger in the lift drops a coin.The acceleration of the coin towards the floor will be

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Zero

g

-g

V + g

Blood vessels under normal conditions are inflate

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Occasionally

Some times

All the times

None of these

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

In between two consecutive permissible energy band there is a range of energy states which cannot be occupied by electrons. These are called

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Energy band

Energy states

Forbidden energy gap

None of these

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

The range of the projectile means a body covers horizontal distance which is

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maximum

Minimum

Distance

None of these

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