Question # 1

Which surface is bad emitter:

Choose an answer

White surface

Black surface

Coloured surface

Silver surface

In which of the following state molecules do not leave their position?

Choose an answer

Solid

Liquid

Gas

Plasma

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

Choose an answer

2

3

4

Any Number

The altitude of geostationary orbits in which communication satellites are launched above the surface of the earth is;

Choose an answer

850 km

1000 km

6400 km

42300 km

Unit of thermal conductivity is .

Choose an answer

Wmk

W m^-1 K^-1

Wm

None of these

Minor but rapid change in atmospheric pressure cause:

Choose an answer

Poor condition

Intense condition

Windy condition

Pleasant condition

Newton per meter square is a unit of:

Choose an answer

Pressure

Stress

Both A and B

Force

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

Choose an answer

Increase P.E

Decrease P.E

Decrease K.E

None of these

The numebr .00580 is scientific notation is.

Choose an answer

5 .80 x 10⁵

5 .80 x 10^-4

5 .80 x 10^-3

5 .80 x 10^-2

Centripetal acceleration of a body is given by formula:

Choose an answer

a_c=v/r

a_c=mv²/r

a_c=v/r²

a_c=v2/r

Centre of gravity of uniform square is:

Choose an answer

Intersection of diagonals

Point of intersection of medians

At centre

None of these

The speed of sound in a liquid is …………..than that in gases:

Choose an answer

Ten times

Fifteen times

Five times

Two times

A converging mirror with a radius of 20cm creates a real image 30 cm from the mirror. What is the object distance:

Choose an answer

5.0 cm

7.5 cm

15 cm

20 cm

How many tubes or electron guns used in a colour television set:

Choose an answer

Two

Four

Five

Three

The time period of frequency and time period is equal to:

Choose an answer

v

1

0

λ

The unit of spring constnat is:

Choose an answer

m

kg

Nm²

Nm^-1

Pitch of sound depends upon:

Choose an answer

Frequency

Amplitude

Intensity

Time period

The loudness of sound is most closely related to its:

Choose an answer

Freqeucy

Period

Wavelength

Amplitude

Joule's law is W = ____________________

Choose an answer

IR/t

IRt²

IR²t

I²Rt

In simple harmonic motion, the acceleration of the body is…………. Proportional to the displacement.

Choose an answer

Inversely

Directly

Equally

Ration

The value of acceleration is simple harmonic motion at mean position is:

Choose an answer

Maximum

Zero

10 N

Both a and b

What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added:

Choose an answer

Increases

Decreases

Remains the same

Cannot be predicted

An elevator is moving up with an acceleration equal to 'g' An apparent weight of the body in an elevator is.

Choose an answer

Zero

Equal to real weight

2 mg

3 mg

The Detector in Photo phone is made up of.

Choose an answer

Cadmium

Germanium

Selenium

Silicon

The orbital angular momentum is associated with the motion of a body along

Choose an answer

Straight path

Circular path

Curved path

Along any path

In vibrating string, the points where the amplitude is maximum are called.

Choose an answer

Nodes

Antinodes

Troughs

Crests

100 radians are equal to.

Choose an answer

57.3^o

75.3^o

573^o

5730^o

The frequency of waves produced in microwave oven is

Choose an answer

1435 Hz

2450 MHz

1860 MHz

2850 Hz

The weight of an object an elevator moving down with an acceleration of 9.8 m/s2 will becomes

Choose an answer

Half

Double

Unchanged

Zero

Choose an answer

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

Choose an answer

5

10

15

25

The amount of inertia of 10 kg hoop about the axis of rotation perpendicular to its plane having radius 5 m is

Choose an answer

50 kgm2

100 K gm2

150 K gm2

250 K gm2

When newton ring are seen through the transmitted light, then central spot is.

Choose an answer

Dark

Blue

Bright

Red

An ideal current source shall have resistance

Choose an answer

Zero

Finite but not zero

Infinite

Depend upon requirement

The value of e/m is smallest for

Choose an answer

Proton

Electron

Beta particle

Positron

Which of the following does not undergo plastic deformation.

Choose an answer

Copper

Wrought iron

Head

Glass

The existence of positron was discovered in:

Choose an answer

1929

1928

1931

1933

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

Choose an answer

0.2 henry

0.1 henry

0.8 henry

0.04 henry

We can find from de Broglie formula

Choose an answer

Wavelength

Amplitude

Speed of wave

Frequency of wave

X- ray diffraction reveals that these are

Choose an answer

Particle type

Wave type

Both wave and particle

None of above

Number of electros emitted in photo electric effect depend upon.

Choose an answer

Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

The first orbit in the hydrogen atom has a radius.

Choose an answer

0.53 nm

0.053 nm

0.0053 nm

0.00053 nm

The maximum kinetic energy of emitted photo electrons depends upon.

Choose an answer

The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

A charged particle having charge 'q' is moving at right angle to magnetic field. The quantity which varies is.

Choose an answer

Speed

Kinetic energy

Path of motion

angular velocity