Question # 1

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

If the mass of the simple pendulum becomes double, its time period

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increase

decreases

remains constant

none of them

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

An A.C varies as a function of

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Current

Voltage

Time

Charge

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

Bernoulli's equation is the fundamental equation in fluid dynamics, which relates pressure to fluid

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speed

height

none of them

both of them

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

According to kinetic theory of gases, molecules of a gas behave like

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Inelastic spheres

Perfectly elastic rigid sphere

Perfectly elastic non-rigid spheres

Inelastic non-rigid spheres

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

If g is the acceleration due to gravity on the surface of the earth, then the value of the acceleration due to gravity at height equal to R/2 from the surface of earth is (R is the radius of the earth)

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g/2

2/3 g

4/9 g

5/9 g

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

The vector sum of three vectors gives a zero resultant. What can be the orientations

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90^o

60^o

120^o

180^o

When 'θ' is small then

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tan θ ≈ sin θ

cos θ ≈ sin θ

sin θ ≈ tan θ

None of these

A disc roll down a hill of 10.0 m from rest without slipping. What is its speed at the bottom

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10.2 ms^-1

11.3 ms^-1

11.4 ms^-1

None of these

Stoke s law holds for

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Cubical bodies

Cylindrical bodies

Spherical bodies

Elliptical bodies

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

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80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

In diffraction grating has feature/features like

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A glass plate

A large numbers of lines are ruled

Spacing between two lines acts as a slit

All of these

Conductors are those materials in which the free electrons

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Very large

Very small

Plenty of

None of these

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