Question # 1

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

The magnitude of the force producing an acceleration of 10 m/sec2 in a body of mass 500 grams is:

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3 N

4 N

5 N

6 N

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

The motion of a projectile is

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one dimension

two dimension

three dimension

all of them

Gas constant per molecule is called:

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Universal gas constant

Stefen's constant

Boltzmann constant

Gravitation constant

Referring to above figure, current in coil P falls from its maximum value to zero:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

When switch is kept closed

None of these

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

The time of flight of a projectile motion equal to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

First law of thermodynamic is special case of

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Law of conservation of energy

Charle's law

Law of conservation of mass

Boyle's law

Under the elastic region, the deformation produced in the material is

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permanent

temporary

either of them

none of them

In Huygen's wave theory the locus of all points in the same state of vibration is called

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A half-period zone

Vibrator

Wave front

A ray

If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be:

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-2 mv

Zero

2 mv

mv

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

With increase in temperature the viscosity of

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Both gases and liquid increase

Both gases and liquid decrease

Gases increases and of liquid decrease

liquid increases and of gases decreases

In Micheal sons interfrometes apparatus the numbers of mirrors and glas plates are used respectively ara

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2,3

3,2

3,3

2,2

A closed organ pipe and an open organ pipe have their first overtones of identicalfrequency. Their respective lengths are in the ratio:

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1 : 2

4 : 3

2 : 3

3 : 5

The unit of work function is

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eV

Volt

Farad

Herdz

A man sitting in a bus traveling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down.To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

The ratio of diameters of two convex lenses is ______ the ratio of their focal lengths

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Greater than

Less than

Equal to

Square of

When temperature increases, viscosity of liquids

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Remains constant

Increases

Decreases

Becomes double

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