Question # 1

Which of the following is the unit of momentum?

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Nm

kgms^-2

Ns

Ns^-1

Thermoflask is used maintain:

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Heat

Temperature

Density

Pressure

The value we get after rounding 1.47 is

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1.4

1.5

1.47

1.46

Celsius temperature is converted into Fahrenheit temperature using the formula

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F = 1.8 C + 32

F = 1.8 C - 32

F = 1.4 C + 32

F = 1.4C - 32

More radiation is reflected by the surface.

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White

Coloured

Black

Rough

Which one of the following units is not a derived unit?

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Pascal

Kilogram

Newton

Watt

Motion of the rocket is the example of which law?

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First law

Second law

Third law

Law of momentum

When ice is cooled below 0 ^oC it:

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Expand

Contracts

Boils

None of these

A car is made on the principles of

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Electronics

Thermodynamics

Electricity

Mechanics

Rolling friction is___________ then sliding friction :

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Greter

Less

Some

Half

Friction is due to

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Roughness

Shape

Smoothness

None

Joule's law is W = ____________________

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IR/t

IRt²

IR²t

I²Rt

Which is the best material for making connecting wires:

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Iron

Copper

Tungsten

Nickel

Release of the energy by the sun is due to:

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Nuclear Fussion

Nuclear Fission

Burning of gases

Chemical reaction

CD which is made of soft material is called:

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Hard disk

Floppy disk

Iron disk

Copper disk

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

The amount of current that can be felt is:

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1A

0.1A

0.001 A

2A

Totally reflecting prism is used in:

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Periscope

Binoculars

Periscope and binocular

Telescope

As the temperature of a conductor rises, its resistance:

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Increases

Decreases

Does not change

None of these

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

Ultrasound waves carry energy:

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Less

More

Equal

None of these

Vector has both of its components are negative lies in

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1st quadrant

2nd quadrant

3rd quadrant

4th quadrant

When two identical waves superimposed, which can change.

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Wave length

Frequency

Velocity

Amplitude

Name the quantity which is a vector.

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Speed

Force

Temperature

Density

The path followed by a projectile in known as its

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Range

Trajectory

Cycle

Height

Angular momentum has the same unit as

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Impulse x distance

Power x time

Linear x time

work x frequency

At which of the following temperature a body has maximum internal energy.

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-273 ^oC

0 K

273 K

-273 K

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

At which place the motion of a simple pendulum will be slowest.

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Karachi

K-2

Murree

Lahore

The experimental value for the velocity of sound in air is

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233 m-sec^-1

333 m-sec^-1

433 m-sec^-1

533 m-sec^-1

If the object is at 5 cm from the lens of simple microscope than its magnifying power will be.

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5

10

15

25

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

A dot represents the direction of magnetic field.

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Out of page

Into the page

Tangent to page

Parallels to page

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

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None of the above

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

The vessel containing the tow electrodes and liquid to known as.

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Chemical cell

Volt cell

Volta cell

Volta meter

Lenz's law is a consequence of the law of conservation of

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Charge

Momentum

Energy

Angular momentum

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

In full wave rectification number of diodes required are equal to.

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2

3

4

5