Question # 1

According to law of conservation of energy increases in P.E is equal to:

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Increase K.E

Decrease in K.E

Decrease in P.E

None

Two equal but unlike parallel forces having different lines of action produce:

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a Torque

a couple

Equilibrium

Netural equilibrium

The Mars has value of g

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25.94 m/sec2

3.73 m/sec2

1.62 m/sec2

8.87 m/sec2

The ability of body to do work is called:

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Power

Energy

Work

Efficiency

kgm²s^-2 = _________

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Newton

Joule

Watt

Coulomb

The number of forces that can be added by head to tail rule are

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2

3

4

Any Number

In graph referenc epoint is taken as.

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Origin

x-axis

variable

coordinates

A couple consists of how many forces:

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1

2

3

4

Both metals and non-metals transfer:

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Electricity

Heat

Both A and B

None of these

Weight of the body is due to the :

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Gravitation force

Centripetal force

Centrufugal force

All of the above

The force exerted by earth on moon is :

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2.01× 1020 N

2.01× 1020 Kg

2.01× 1021 N

2.01× 1022 Kg m/s2

If the distance is nspring is 'x' of mass 'm' attached with a spring then restoring force is:

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F =ma

F =kx

F = mx

F= m/a

In a convex mirror the size of the image:

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Is smaller than the size of the object

Is greater than the size of the object

Depends upon the position of the object

Is equal to the size of the object

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

Snell' law is:

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n = sin<x/sin <r

n=sin <i/sin<r

n = sin <r/sin<i

<i/<r

Which we double the voltage in a simple electric circuit. We double the

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Current

Power

Resistance

both a and b

A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete wae in distance of 50 cm. The velocity of the wave is:

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54 cms^-1

60 cms^-1

750 cms^-1

1500 cms^-1

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

Which of the following is a method of energy transfer:

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Conduction

Radiation

Wave motion

All of these

The speed of sound in iron at 25 ^oC is ms^-1

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5950

5900

6950

6940

What happen to the atomic number of an element which emits one alpha particle?

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Increase by 1

Stays the same

Decrease by 2

Decrease by 1

The waves in which particles of the medium vibrate perpendicular to the direction of waves are:

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Electromagnetic waves

Sound waves

Both a and b

Transverse waves

Sound travel faster in

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CO2

H2

O2

He

Food rich in proteins is:

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potato

grapes

vegetables

bread

A Carnot engine has an efficiency of 50% when its sink temperature is at 27 ^oC. The temperature of source.

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273^oC

300 ^oC

327 ^oC

373 ^oC

The artificial satellites are held in orbits by

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Gravitational force

Electric force

Magnetic force

All of these

More details of an object can be seen with a microscope by using

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Green light

Red light

Yellow light

Blue light

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

Time period of geostationary satellite of radius 'R' is

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1 hour

48 min

1 day

1 month

The trajectory of a projectile is.

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Circle

Parabola

Hyperbola

Straight line

Salter's duck was invented by

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Newton

Einstein

Prof Salter

Maxwell

Which is unimportant in describing the satellites orbit.

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Distance of satellite from earth's center

Gravitational constant G

Mass of satellite

Mass of earth

When a fore of 100 N is acting on an object along x-axis then its vertical component will be.

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50 N

0 N

25 N

10 N

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

Which is not fundamental logic gate.

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NOT

AND

OR

NAND

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

Tolerance of "Gold" band.

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±10%

±5%

±15%

±20%

If 1 x 10⁷ electrons passes through a conductor in 1.0 micro second , then the current is.

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2 A

1.6 A

2.6 x 10^-6 A

1.6 x 10^-6 A

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

Boher proposed his atomic model in:

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1910

1911

1912

1913

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π