Question # 1

The centre of gravity of irregular shaped body can be found with the help of:

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Wedge

Meter rod

Plumb line

Screw gauge

Which of the following is produced in refrigerators by evaporation of a liquefied gas?

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Heating

Cooling

Freezing

Melting

Metals are good conductor of heat due to:

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Free electrons

Reamain same

Small size of their molecules

Rapid vibration of their atoms

According to Archimedes, upthrust is equal to

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Weight of displaced liquid

Volume of displaced liquid

Mass of displaced liquid

None of these

Friction is caused by :

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Shining surface

Rough surface

Polished surface

Nil

The product of force and distance is :

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Force

Work

Torque

Nil

The S.I unit of power is:

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Newton

Watt

Joule

Coulomb

The unit of torque is:

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N

Nm

m

m/n

The speed of light is equal to:

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3 x 10⁵ ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10²ms^-1

Action and Reaction are always on:

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Same body

Different bodies

Any body

None of these

The unit of momentum is:

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kgms^-2

kgms^-1

Ns^-1

None of these

Which combination forms NAND gate:

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AND & OR

AND & NOT

NOT & OR

NAND & NOT

The process of breaking a heavy nucleus after the bombardment of neutrons into two small nuclei is called:

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Nuclear fission reaction

Nuclear fusion reaction

Nuclear Radiation

Nuclear chain reaction

the power of washing machine is:

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700 W

750 W

650 W

800 W

the water waves after striking the hurdle will:

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reflect

refract

diffract

all a b and c

Capacitance is defined as:

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VC

Q/V

QV

V/Q

The sound waves are the example of:

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Longitudinal waves

Transverse waves

Electromagnetic waves

x-rays

If a dielectric medium is present between two point charges them electrostatic force will be:

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Increased

Decreased

Vanishes

Remain same

The intensity of lawn mover is:

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10^-1 wm^-2

10^-2wm^-2

10^-1wm^-3

10^-3wm^-2

Which of the following reasons increase the importance of computer:

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Speedy

Long time storage of memory

Quick decision

All of these

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

The data stored in C.D. is.

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680 MB

650 MB

700 MB

750 MB

Total confined light is obtained by

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Total internal reflection

Refraction of light

Diffraction

Polarization

The motion of a simple pendulum is the example of

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Vibratory motion

Rotatory motion

Periodic motion

Both a and c

If a vector of magnitude 10 N along y-axis then its component along x-axis is

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0 N

5 N

8.66 N

10 N

Critical angle is that angle of incident ofr which angle of refraction is.

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90 ^o

45 ^o

42 ^o

24 ^o

An immediate source of energy for our body is:

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mango

Glucose

mushroom

meat

First law of thermodynamics can be defined by the equation

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The dimension of viscosity are

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[M2L-2T2]

[M-1LT-1]

[M-1L-1T]

[ML-1T-1]

The optical fibre is covered for protection by

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Glass jacket

Plastic jacket

Steel jacket

Diamond jacket

The entropy of the universe with passage of time is.

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Increases

Decreases

Remain constant

Increases and decreases

The curve representing an adiabatic process is called.

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An adiabatic

An isotherm

Both of these

None of these

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

Two parallel wires carrying currents in the opposite direction.

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Repel each other

Attract each other

Have no effect upon each other

They cancel out their individual magnetic fields.

Which one is not a crystalline solid.

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Zinc

Copper

Nylon

None of these

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

Vrms =

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0.7V_∘

0.07V_∘

0.007V_∘

0.75V_∘

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn