Question # 1

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Wavelength of different colors is different

Velocity of different colors is different

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

In series RC circuit when R=X_c, then the phase angle is

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0°

90°

70°

45°

A current of 1.6 A is passed through a solution of CuSO_{4. How many Cu}²⁺ions are liberated in one minute?

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3 x 10²⁰

3 x 10¹⁰

6 x 10²⁰

6 x 10¹⁰

The value of output resistance of OP-AMOP is of the order of

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few ohms

few hundred ohms

several kilo ohms

several mega ohms

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

Ethanol (alcohol) is a type of:

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Electric fuel

Bio fuel

Nuclear fuel

None of these

If F=0.04 N and X=4 cm then K=

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1 Nm^-1

2 Nm^-1

3 Nm^-1

4 Nm^-1

The velocity of falling raindrop attains limited value because of

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Up trust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

A galvanometer in which the coil comes to rest quickly after the current passed through it, or the current stopped form flowing through it, is called

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dead beat galvanometer

stable galvanometer

shunt galvanometer

sensitive galvanomter

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

When an atom is isolated, it energy levels are

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Distinct

Very close

Very very close

None of these

The original source of biomass energy is

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Moon

Sun

Geothermal

None of these

For an adiabatic expansion of a gas which of the following statement is false?

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Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

Examples of crystalline solids are:

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Copper

Zirconia

NaCI

All of these

Both A and B

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

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Zero

10 N

20 N

10 √2 N

Two particles of equal masses are revolving in circular paths of radii r₁ and r₂respectively with the same speed The ratio of their centripetal force

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r₂/r₁

√(r₂/r₁)

(r₂/r₁)

(r₂/r₁)²

Which of the following theories of light are explained by the Young's double slit experiment?

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wave theory of light

particle nature of light

dual nature of light

corpuscular nature of light

The magnitude of torque determines its

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Linear acceleration

Angular acceleration

Moment arm

None of these

A boy is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about

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80 m

20 m

160 m

40 m

The force exerted by the fluid in a hydraulic pump on the piston is 2000 N.If the area of the piston is 10 cm² the fluid pressure on the piston is in N/cm²

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20

200

2000

20000

At high speed and for long trajectories the air friction is

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Negligible

Not negligible

More than gravity

None of these

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