Question # 1

The circuit in which current and voltage are in phase, the power factor is

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zero

1

negative

0.83

The value of the Stephen's constant for black body radiations is given by

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5.6 x 10⁸Wm^-2K^-4

5.67 x 10^-8Wm^-2K^-4

2.9 x 10^-3mK

2.9 x 10³mK

The emission of electrons from a metal surface when exposed to light of suitable frequency is called the

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pair production

Compton effect

photoelectric effect

relativity

When two protons are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

Physicist George Simon ohm was a

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German physical

French physicist

Chinese physicist

Russian physicist

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

The vertical and horizontal range will be equal id angle of projection is

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76°

45°

60°

120°

A railway engine (mass 10⁴kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is

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3,600 N

7,200 N

10,000 N

100,000 N

Blomass includes:

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Crop residue

Natural vegetation

Animal dung

All of these

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

Energy is stored in the choke coil in the form of

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Heat

Magnetic energy

Electric energy

Electro-magnetic energy

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line.The velocity of flow of water in the pipe 4 cm diameter is

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

When the velocity of a body is decreasing, the acceleration produced is

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Positive acceleration

Negative acceleration

No acceleration produced

None of these

The ratio of volumetric stress to volumetric strain is called

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Young's modules

Bulk modulus

Shear modulus

Hooke's law

If L and R represent inductance and resistance respectively,then dimensional formula of L/R will be

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ML°T°

M°L°T

M°L°T^-2

M°LT^-2

When a droplet falls through a medium with terminal velocity the acceleration is

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Maximum

Minimum

Constant

Zero

Period of audible sound waves is

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1 × 10^-4 sec

1 × 10^-3 sec

1 × 10^-2 sec

1 × 10^-1 sec

Position vector is a vector which is drawn

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From one point to another

From origin to that point

Always from origin to that point

None of these

In a compound microscope the intermediate image is

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Virtual erect and magnified

Real,erect and magnified

Virtual,inverted and magnified

Virtual,erect and reduced

There are earth stations which transmit signals to satellites and receive signals via satellite from other countries are

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200

Over 200

400

500

Flux coming out from a unit positive charge placed in air is

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ε_°

ε_°^-1

(4πε_°)^-1

4πε_°

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