Question # 1

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be

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500 m

500 nm

500 km

500 cm

None of these

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

The work done on the body will be zero if:

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No force is applied on the body

Force is applied but no displacement

Angle between F(force) and d(displacement) is 90°

All of these are correct

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

In reverse-biased p-n junction, the reverse current is due to flow of:

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Minority charge carriers

Majority charge carriers

Free electrons from p to n-region

Holes from n to p-region

all are true except (B)

Examples of physical quantities are:

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Length

Color

Effect of music

All of these

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

When the temperature difference between the source and the the sink increases, the efficiency of the heat engine will

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Increase

Decrease

Is not affected

May increase or decrease depending upon the nature of the working substance

According to Huygen's principle, every point of a wavefront may be considered as a source of

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primary wavelets

secondary wavelets

either of them

both of them

Molecules of a solid possess:

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Translation motion

Vibration motion

Rotation motion

Linear motion

A completely transparent material will be invisible in vacuum when the refractive index n is

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Unity

More than unity

Less than unity

Equal to 1.33

If the path difference must be an integral multiple of wavelength

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sin θ = md/λ

d sin θ = mλ

d sin θ = m/λ

d sin θ = λ/m

The typical wavelength of light source in transmitter is

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1.1 μm

1.2 μm

1.3 μm

1.4 μm

The doped semi-conductors materials are known as

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intrinsic semi-conductor

extrinsic semi-conductor

either of them

none of them

The initial velocity with which a body projected upward and never comes back is called

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Kinetic energy

Terminal velocity

Escape velocity

None of these

A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h.The force required to stop the vehicle in 10s force required to stop the vehicle in 10s is:

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120 x 10.8 N

180 N

720 N

360 N

The shaft of a motor is rotating at constant angular velocity of 3000 rpm. The angle turned per second is

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100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

Which of the following is not the unit of energy?

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Calorie

Joule

Electron-volt

Watt

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