We see the image of our face when we look into the mirror. It is due to:
1. Interference
2.Diffraction
3. Polarisation
4.Reflection
Posted Date:-2021-03-15 04:43:59
What happens to the body on which work is done:
1.It loses energy
2. It gains energy
3.No change in the energy
4.First it loses then it gain
Posted Date:-2021-03-15 04:43:59
Which of the following device converts chemical energy in to electrical energy?
1.Battery
2.Loud Speaker
3. Solar Cell
4. Electric Motor
Posted Date:-2021-03-15 04:43:59
Anything which gives out light rays is called :
1.Real Image
2.Virtual Image
3.Object
4.Image
Posted Date:-2021-03-15 04:43:59
 A radio set of 60 watts runs for 50 hours. How many units of electrical energy are consumed in kWh?
1. 2 kWh
2. 3 kWh
3.4 kWh
4.2.5 kWh
Posted Date:-2021-03-15 04:43:59
 An incident ray is:
1. The point at which incident ray falls on the mirror.
2.The ray of light which is sent back by the mirror.
3.The ray of light which falls on the mirror surface.
4. The ray which makes right angle to the mirror surface.
Posted Date:-2021-03-15 04:43:59
 During a calendar year, the maximum numbers of lunar eclipse that can occur are:
1.2
2.3
3.4
4.None of the above
Posted Date:-2021-03-15 04:43:59
 In 1 minute how much energy does a 100 W electric bulb transfers?
1.100 J
2.600 J
3.3600 J
4.6000 J
Posted Date:-2021-03-15 04:43:59
 Name a metal which is the best reflector of light?
1. Gold
2. Silver
3. Iron
4.Magnesium
Posted Date:-2021-03-15 04:43:59
 What is the smallest unit of power?
1.Watt
2.Kilowatt
3.Horse power
4.Milliwatt
Posted Date:-2021-03-15 04:43:59
 When a parallel beam of incident light is reflected as a parallel beam in one direction, this reflection is known as:
1.Diffuse reflection
2.Interference
3.Diffraction
4.Regular reflection
Posted Date:-2021-03-15 04:43:59
 Which of the following are the two separate circuits in a house?
1. Lighting and power circuit
2.Open and closed circuit
3.Series and parallel circuit
4.None of the above
Posted Date:-2021-03-15 04:43:59
 Which of the following devices is run by power circuit in the house?
1.Tube-lights
2.Electric iron
3.Television
4.Radio
Posted Date:-2021-03-15 04:43:59
During lunar eclipse, the visible red colour is because of:
1. Dust in space
2.Dust in moon’s atmosphere
3. Dust in earth’s atmosphere
4.None of the above
Posted Date:-2021-03-15 04:43:59
How much electric potential does the live wire carry?
1.100 volts
2.150 volts
3. 185 volts
4.20 volts
Posted Date:-2021-03-15 04:43:59
In which unit is the electrical energy consumed by us recorded?
1.Volt
2.Kilowatt-minute
3. Kilowatt-hour
4.Kilowatt-second
Posted Date:-2021-03-15 04:43:59
Where do we use transformers?
1.Power stations
2.Radio sets
3.Television
4.All of the above
Posted Date:-2021-03-15 04:43:59
Joule is a unit of:
1.Work
2.Power
3.Momentum
4.None of the above
Posted Date:-2021-03-15 04:43:59
On an object the work done does not depend upon:
1.Displacement
2. Angle between force and displacement
3. Force applied
4. Initial velocity of an object
Posted Date:-2021-03-15 04:43:59
On which theory nature of light depends upon:
1.Wave theory
2.Particle theory
3. Both A and B
4.Only A
Posted Date:-2021-03-15 04:43:59
The commercial unit of Energy is:
1. Watt
2.Watt-hour
3.Kilowatt-hour
4.Kilowatt
Posted Date:-2021-03-15 04:43:59
The energy possessed by a body due to its position is called:
1.Kinetic Energy
2.Potential Energy
3.Mechanical Energy
4.Electrical Energy
Posted Date:-2021-03-15 04:43:59
The image formed on a cinema screen is an example of:
1.Real Image
2.Virtual Image
3.Point Image
4.Plane Image
Posted Date:-2021-03-15 04:43:59
What do you mean by Blood Moon?
1. It is total solar eclipse.
2. It is partial lunar eclipse with red glow
3.It is total lunar eclipse with deep red glow
4.None of the above
Posted Date:-2021-03-15 04:43:59
What do you understand by an eclipse?
1. Partial or total blocking of light of one celestial object by another.
2.Partial or total blocking of light by Moon.
3.Partial or total blocking of light by Earth.
4.Partial or total blocking of light by Sun.
Posted Date:-2021-03-15 04:43:59
What is Solar Eclipse?
1.When moon comes in between Earth and Sun
2. When Earth comes in between Moon and Sun
3.When Sun comes in between Earth and Moon
4. When Sun rays does not reach Earth.
Posted Date:-2021-03-15 04:43:59
What is the colour of insulation covering on live wire?
1.Green
2.Red
3.Black
4.Yellow
Posted Date:-2021-03-15 04:43:59
What is the colour of insulation covering on neutral wire?
1. Blue
2.Red
3.Green
4.Black
Posted Date:-2021-03-15 04:43:59
What is the electric potential of neutral wire?
1.Zero volt
2. 100 volt
3.10 volt
4.10 volt
Posted Date:-2021-03-15 04:43:59
What is the fuse of lighting circuit?
1. 20 A fuse
2.5 A fuse
3.18 A fuse
4.5 A fuse
Posted Date:-2021-03-15 04:43:59
What is the fuse of power circuit?
1. 5 A fuse
2.18 A fuse
3.15 A fuse
4.10 A fuse
Posted Date:-2021-03-15 04:43:59
What is the rating of main fuse which is put in the live wire?
1.10 amperes
2.140 amperes
3.50 amperes
4.65 amperes
Posted Date:-2021-03-15 04:43:59
When an object falls freely towards the ground, then its total energy:
1.Increases
2.Decreases
3.Remains constant
4.First increases then decreases
Posted Date:-2021-03-15 04:43:59
When did Lunar Eclipse happen?
1.Half Moon
2.Full Moon
3.Equinox
4.None of the above
Posted Date:-2021-03-15 04:43:59
When Lunar Eclipse occur?
1.When Sun is between Earth and Moon
2.When Earth is between Sun and Moon
3. When Moon is between Earth and Sun
4.When Earth is between Sun and other celestial bodies
Posted Date:-2021-03-15 04:43:59
When the same pattern of solar eclipse repeats every 18 years 11 days 8 hours are known as:
1. Nodes cycle
2.Saros cycle
3.Saras cycle
4.Payan cycle
Posted Date:-2021-03-15 04:43:59
Which object does not reflect more light?
1.Polished Surface
2. Shining Surface
3.Unpolished
4.Both A and B
Posted Date:-2021-03-15 04:43:59
Which of the following devices is run by lighting circuit in the house?
1. Electric bulb
2. Tube-lights
3.Fans
4. All of the above
Posted Date:-2021-03-15 04:43:59
Why light is said to have a dual nature?
1.It exhibits the properties of wave and particles.
2.It exhibits the properties of reflection and diffraction.
3.It has both interference and polarisation effect.
4.None of the above
Posted Date:-2021-03-15 04:43:59