Question # 1

Center of gravity of an irregular shaped body can be found with help of:

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Screw guage

Plumbline

Meter rode

Wedge

There are ______ modes of transfer of heat:

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1

2

3

4

Mass of earth is approximately _________

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3.7 x 10²⁴ kg

25.94 kg

6.0 x 10²²kg

6 x 10²⁴kg

If we increase the length of spanner the torque produced will be

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Increased

Decreased

Constant

Zero

A Leslie cube has faces:

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1

2

3

4

SI unit of pressure is pascal, which is equal to:

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10⁴ Nm^-2

1 Nm^-2

10²Nm^-2

10³ Nm^-2

The devise used to measure the atmosphere pressure is:

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Rain gauge

Vacuum cleaner

Screw gauge

Barometer

The transfer of heat by vibrating molecules in solids :

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Conduciton

Radiation

Convection

None

The main source of energy in the unierse is:

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Moon

Stars

Sun

Planets

According to Archimedes, up thrust is equal to :

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Weight of displaced liquid

Volume of displaced liquid

Mass of displaced liquid

None of these

ΣF=0 is __________ condition of equilibrium:

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1st

2nd

Unstable

Stable

The half of carbon 14 is

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5720 years

5730 years

5740 years

5750 years

The S.I unit of potential difference is:

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Ampere

Coulomb

Volt

Watt

The line which passes through pole of the mirror and center of curvature is called principal:

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Axis

Focus

Line

None of these

The ray of the light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

None of these

Which component is output device of computer:

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CPU

C.D

Keyboard

Monitor

The totally reflectiing prism one angle is of:

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45^o

90^o

180^o

120^o

The symbol of AND operation is:

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+

-

.

*

In D.C.motor split rings are made of:

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Steel

Carbon

Copper

Iron

Mathematical formula of sound level (in bel) is:

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S.L = 10 log I/Io (bel)

S.L = K log I/Io (bel)

S.L = Log I/Io (bel)

S.L = 10 log Io/I (bel)

A data storage device is.

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Printer

Hard disk

Monitor

CPU

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

A body starting from rest attains angular acceleration of 5 rad s-2 in 2 second final angular velocity will be.

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10 rad s-1

7 rad s-1

3 rad s-1

2 rad s-1

In the absence of external force, the change in momentum is.

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Zero

Constant

Decreasing

Increasing

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

When hot and cold water are mixed, the entropy.

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Decreases

Increases

Remain constant

Zero

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

The regular or steady flow of fluid is called

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Stream line

Turbulent flow

Average flow

None of these

A 60 kg man in an elevator is moving upward with an acceleration of 9.8 ms-2. The apparent weight of the man.

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Increase

Decreases

Remain constant

Becomes zero

The frequency of waves produced in microwave oven is

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1435 Hz

2450 MHz

1860 MHz

2850 Hz

If a mass of a body is doubled, then acceleration becomes.

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Double

Half

One fourth

Constant

The dimensional of potential energy per unit volume are same as that of.

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Work

Pressure

Speed

Density

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

One ohm is equal to

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VC-1

CV-1

AC-1

VA^-1

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

The unit of permiability of free space is:

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T.m/A

T.m²/A

T.m/A²

None of these

Reflecting mirrors in laser is used to

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Further stimulation

For producing more energetic lasers

Both (a) and (b)

None of these

The power factor of RL series circuit is.

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0

1

Less then 1

More than one

By emitting Beta particle and gama particle simultaneously the nucleolus changes in its charges by

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N

N/2

N/4

3N/4

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson