Question # 1

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

A beam of electrons is provided by an

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electron gun

Suppray

Injection

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 is

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120 x 10.8 N

180 N

720 N

360 N

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Flurescent screen is a screen where visible spot

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vanishes

is made

becomes small and large

none of these

If force and displacement are in opposite direction, the work done is taken as

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Positive work

Negative work

Zero work

Infinite work

It is customary represent a current flowing towards the reader by a symbol

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(x)

(+)

(.)

(-)

(÷)

At high speed, fluid friction _____ and fuel consumption ___,:

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Increases, decreases

Increases, increases

Decreases, increases

None of these

When brakes are applied to a fast moving car, the passenger will be thrown:

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Forward

Backward

Downward

none of these

If A represents linear momentum and c, the velocity of light, then unit of pc in international system of units is:

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Newton

Joule

Joule-Sec

Joule-s^-1

Watt

The escape velocity of a body depends upon

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The mass of the body

The mass of the planet

Volume of body

Density of body

Thermodynamics is the branch of physics deals with the conversion of heat energy into

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Electrical energy

Mechanical energy

Solar energy

None of these

If the unit of length, mass and time each be doubled, the unit of work is increased by

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2 times

6 times

4 times

8 times

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

The energy of molecular motion appears in the form of

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Friction

Heat

Viscosity

Potential energy

A typical rocket consumers fuel of about

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5000 Kgs^-1

10,00 Kgs^-1

10000 Kgs^-1

100000 Kgs^-1

The initial velocity of a body moving along a straight line in 7 m/s.It has a uniform acceleration of 4 m/s².The distance covered by the body in the 5th second of its motion is

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25 m

35 m

50 m

85 m

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

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 velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

The rate of change of angular momentum is

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The applied force

The moment of inertia

The applied torque

Impulse

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