Question # 1

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

On loading the prong of a tuning fork with wax, the frequency of sound.

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Increases

Decreases

Remains same

First increases then decrease

At what speed the momentum and kinetic energy of a body having the same.

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1 ms-1

2 ms-1

4 ms-1

8 ms-1

The velocity of a free falling body just before Hattin the ground is 9.8 ms-1, the height through which is fall be

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98 m

19.6 m

4.9 m

9.8 m

What would encourage trade between two countries

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Different tax system

Frontier checks

National currencies

reduced tariffs

The shape of trajectory of short range projectile is

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Straight line

Circle

Elliptical

Parabolic

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

Number of seconds in a day is

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9000 sec

3600 sec

86400 sec

43200 sec

An immediate source of energy for our body is:

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mango

Glucose

mushroom

meat

the shortest distance between two points is called.

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Speed

Acceleration

Distance

Displacement

Unit of acceleration is

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ms-1

ms

ms-2

m2s

The speed of stars and galaxies can be calculated by

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Compton effect

Stefan's law

Doppler's effect

Pascal's law

If heat is added to a system, then its entropy will.

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Increases and positive

Decrease and positive

Increases but negative

Decreases but negative

The resultant of two vectors having magnitude 10 N and 8 N Can not be

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2 N

9 N

18 N

20 N

A force of 20 N acts along x axis, tis component is.

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0 N

10 N

20 N

30 N

The focal length of convex lens

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Negative

Positive

small

Large

the distance covered during one vibration of an oscillating body in terms of amplitude 'A' is

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A/2

A

2A

4A

If 332 waves pass through a medium in 1 second with speed of 332 ms-1 then wavelength will be

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7 m

332 m

664 m

1 m

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