Question # 1

The numer of significant figureswith the increases accracy of the measuring instrument

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Decreases

Remains unchanged

Increasees

None of these

The resultant of two vectors having magnitude 12 N and 8 N can not be

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2 N

20 N

10 N

16 N

Slope of velocity time graph describes a physical quantity called.

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Displacement

Average velocity

Average acceleration

Momentum

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

When a body is vibrating its displacement from mean position

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Remains constant

Changes with time

Become(-)ve

None of these

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

According to first law of thermodynamics the quantity which is conserved.

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Force

Momentum

Energy

Power

The equations of motion hold good for

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Variable acceleration

Uniform acceleration

Centripetal acceleration

All of these

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

Fringe spacing is inversely proportional to.

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Wave length

Slit separation

Distance between the slit and screen

Frequency of light

The device used to study the spectra from different sources of light is

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Telescope

Optical fibre

Spectrometer

Microscope

An oscillating mass-spring system produces

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Sound waves

Electromagnetic waves

Light waves

Periodic waves

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Unit vector

+ve of a vector

Resultant vector

-ve of a vector

The work done by centripetal force is

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(-)ve

(+)ve

Maximum

Zero

The focal length of convex lens

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Negative

Positive

small

Large

Newton's rings are formed due to phenomenon of.

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Interference

Dispersion

Diffraction

Polarization

The light signal in Opticla fiber must be regenerated by advice called.

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Regenerator

Generator

Repeater

Diode

A force of 100 N makes an angle of 60o with Y- Axis, its horizontal component is.

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50 N

60 N

70.7 N

86.6 N

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