Q.1:- Light from the sun reaches earth in about?
Ans:- 8 Minutes
Q.2:- The time period of a pendulum depends on?
Ans:- The Length
Q.3:- Cooling is not done by?
Ans:- Burning Cooking Gas
Q.4:- What type of electromagnetic radiation is used in the remote control of a television?
Ans:- Infrared
Q.5:- Air is filled in vehicle tyres because?
Ans:- It is highly compressible
Q.6:- Dynamo is a machine which is used for conversion of?
Ans:- Mechanical energy to electrical energy
Q.7:- The image of the object that we see forms on the retina of our eyes is?
Ans:- Always Inverted
Q.8:- Sodium vapour lamp is usually used in street light, because?
Ans:- Light from this is monochromatic, and will not split through the water droplets.
Q.9:- Red light is used as danger signal because it?
Ans:- is scattered least
Q.10:- Wavelength range of visible light is?
Ans:- 390 – 780 nm
Q.11:- Sound travels fastest in?
Ans:- Metal
Q.12:- A metal sheet with a circular hole is heated. The hole?
Ans:- Gets Larger
Q.13:- Food in the pressure cooker is cooked faster, as?
Ans:- The boiling point increases due to an increase in pressure.
Q.14:- The Finger prints on a piece of paper may be detected by sprinkling fluorescent powder on the paper and then looking it into?
Ans:- Ultraviolet Light
Q.15:- The special technique used in ships to calculate the depth of ocean beds is?
Ans:- SONAR
Q.16:- Solar energy is produced by the following reaction?
Ans:- Fusion Reaction
Q.17:- A long jumper runs before jumping because he?
Ans:- Maintains momentum conservation
Q.18:- Which zone of a candle flame is the hottest?
Ans:- Middle Luminous Zone
Q.19:- Sound cannot travel though?
Ans:- Vacuum
Q.20:- What is the order of magnitude of electric resistance of the human body (dry)?
Ans:- 104 Ohm
Q.21:- The working principle of a washing machine is?
Ans:- Centrifugation
Q.22:- The clouds float in the atmosphere because of their low?
Ans:- Density
Q.23:- Microwave oven consumes less power due to?
Ans:- Short wavelength of radiation
Q.24:- The frequency of A.C. mains in India is?
Ans:- 50 c/s
Q.25:- The lift of an air plane is based on?
Ans:- Bernoulli’s theorem
