21. Solar energy is due to
Ionization
Nuclear Fusion
Nuclear Fission
Oxidation
22. What is the colour of the 'black box' in an aeroplane?
Black
Red
Violet
Orange
24. Radar is used for:
Detecting objects by using light waves
Reflecting sound waves to detect objects
Determining the presence and location of objects with radio wave
Tracking rain-bearing clouds
25. The diamond appears lustrous because of:
Reflection
Refraction
Total International Reflection
Scattering
26. A sudden fall in barometer reading indicates that the weather will be:
Calm and Quiet
Rainy
Cool
Stormy
27. Neutron was discovered by:
Chadwick
Rutherford
Bohr
Newton
28. Relative humidity is measured by:
Hydrometer
Hygrometer
Lactometer
Potentiometer
29. Pyrometer is used for measuring:
Air Pressure
Humidity
High Temperature
Intensity of Earthquake
30. Assertion 'A' and Reason 'R' are given below. Study them and choose the correct answer from the codes given below: Assertion (A): Lightning conductors prevent buildings from damages. Reason (R): It passes the charge to the earth. Codes:
Both A and R are true and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false, but R is true.
31. Which one of the following is not matched?
Manometer – Pressure
Carburetor – Internal combustion engine
Cardiograph – Heart movement
Seismometer – Curvature of surface
32. At which temperature superconductivity can be of tremendous economic interest saving billions of rupees?
At very low temperature
At a temperature when semiconductor becomes a superconductor
At room temperature
At a very high temperature
33. Stars obtain their energy from: 1. Nuclear fusion 2. Gravitational contraction 3. Chemical reaction 4. Nuclear fission Codes:
1 and 2
1, 2 and 3
1 and 4
2 and 4
34. Which one of the following instruments is used for locating submerged objects in an ocean?
Audiometer
Galvanometer
Sextant
SONAR
35. Assertion (A): Woollen clothes keep us warm. Reason (R): Wool fibers are made of a particular protein which is a bad conductor of heat. Select the correct answer using the codes given below: Codes:
Both A and R true and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false, but R is true.
36. Assertion (A): A black hole is an astronomical entity that cannot be seen by telescope. Reason (R): The gravitational field on a black hole is so strong that it does not allow even light to escape. Select the correct answer using the codes given below: Codes:
Both A and R are true and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true, but R is false.
A is false, but R is true.
37. The energy of the sun is produced by:
Ionisation
Nuclear fusion
Nuclear fission
Oxidation
38. Which one of the following is not correctly matched?
Decibel – Unit of loudness of sound
Horsepower – Unit of power
Nautical mile – Unit of distance in navigation
Celsius – Unit of heat
39. Consider the following statements: 1. Fibre optics is based on the principle of total internal reflection. 2. In optical fibre communication system, power consumption is extremely low. 3. Optical fibre communications are free from radio frequency interference. 4. In India, Reliance group of Industries is engaged in the manufacture of optical fibre. Of these statements:
1, 2 and 3 are correct
1, 2 and 4 are correct
1, 3 and 4 are correct
2, 3 and 4 are correct
40. Which one of the following pairs is not correctly matched?
Discovery of Meson – Hideki Yukawa
Discovery of Positron – C.D. Anderson & U.F. Hess
Theory of energy – H.A. Bethe production in the sun and stars
Synthesis of – Enrico Fermi transuranic elements
12 Total Test
360 Total Question
Scientifically designed for PCS
A must have for Civil services aspirant
IAS PCS SCC and others
75 Total Test
2250 Total Question
Scientifically designed for PCS
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IAS PCS SCC and others
69 Total Test
2070 Total Question
Scientifically designed for PCS
A must have for Civil services aspirant
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