Question # 1

if force on body on y-axis is 100N than x-axis is:

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1000 N

200 N

600 N

0 N

Liquid pressure at depth h is:

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p/gh

h/pg

pgh

i/pgh

Sliding friction can be converted into rolling friction by using

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Levers

Wedges

Ball bearings

Pulleys

Ship and boats are designed on the principal of

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Charge

Densities

Volume

Floatation

The value of g on moon's surface is 1.6 ms^-2. What will be the weight of a a 100 kg body on the surface of the moon?

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100 N

160 N

1000 N

1600 N

Kinetic energy of the molecules depends on its:

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Temperature

Surface are

Density

Volume

The value of tan 45^ois:

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0.5

1.732

1

0.5777

Such state of matter which has no specific shape is called:

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Solid

Liquid, Gas

Gas

Solid and plasma

The centre of gravity of uniform triangle is:

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Point of intersection of medians

On its vertex

On middle point of its axis

Point of intersection of diagonal

The height of geostationary satellites with respect to Earth is

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36,300 km

40,300 km

30,300 km

42,300 km

The type of hydrometer which is used to measure the concentration of acid in a battery is called:

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Chemical meter

Acid meter

Barometer

pH meter

If one of the resistors in a parallel circuit is removed, the total resistance will be:

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Doubled

Decreased

Increased

Remain same

The current used in houses is:

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A.C.

Conventiona current

Current

D.C

Diffraction of wave can be observed clearly only when the size of slit or obstacle is nearly__________ to the wavelength of the wave:

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Two times

Equal

Four times

None of these

AND gate can be formed by using two:

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NOT gates

OR gates

NOR gates

Nand gates

Optical fibres works on the principle of:

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Reflection

Refraction

Total internal reflection

Diffraction

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

The speed of sound was accurately measured in:

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1736

1737

1738

1739

The water waves obey the laws of:

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Reflection

Refraction

Diffraction

All of these

The characteristics of sound by which we can distinguish between two sounds of same loudness and pitch is called.

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Intensity

Quality

Loudness

Pitch

Why household appliances should be connected in parallel with the voltage source:

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To increase the resistance of the circuit

To decrease the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source

One coulomb is equal to charge of ________ electrons.

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6.25 x 10^-19

6.25 x 10¹⁹

6.25 x 10¹⁸

6.25 x 10^-18

The SI unit of angular momentum is

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J.S-2

J.S-1

J.S

J.m

Which quantity of the following is dimensionless.

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Angular velocity

Centripetal force

Angular acceleration

Angular displacement

The Detector in Photo phone is made up of.

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Cadmium

Germanium

Selenium

Silicon

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

The ability of a body to do work is called its

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Force

Power

Capacity

Energy

The increase in thermal pollution of environment means.

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Increase in the entropy

Decrease in the entropy

Entropy remains constant

Entropy becomes zero

The work done is isochoric process is.

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Constant

Variable

Zero

Depend upon condition

Fringe spacing is inversely proportional to.

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Wave length

Slit separation

Distance between the slit and screen

Frequency of light

Heat is form of.

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Power

Momentum

Energy

Torque

If heat engine absorb 400 J and rejects 200 J heat energy, its efficiency will be.

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25%

50%

70%

100%

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

The SI unit of E is NC-1 and that of B is Na-1 m-1 then the unit of E/B is.

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ms-2

ms

ms^-1

m-1s-1

Absorbed Dose 'D' is defined as

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m/E

E/C

C/m

E/m

amu =

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1.06 x 10^-27 kg

1.6606 x 10^-27 kg

1.520 x 10^-21 kg

1.6606 x 10^-31 kg

The Lenz's law fulfils.

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Law of conservation of energy

Law of conservation of charge

Law of conservation of momentum

Kirchhoff's law

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

Balmer Empirical formula explains the electromagnetic radiation of any excited atom in terms of their.

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Energy

Mass

Wave length

Momentum

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf