Science & Technology

16. In an atomic nucleus, neutrons and protons are held together by A.     gravitational forces B.     exchange forces […]

11. Which of the following has a least penetrating power? A.     All have same penetrating power B.     Beta

6. The wavelength of X-rays is of the order of A.     10 micron B.     1 angstrom C.   

1. Which of the following is used as a moderator in nuclear reactor? A.     Thorium    B.     Graphite C.

16. Nautical mile is a unit of distance used in A.     navigation B.     road mile C.     astronomy

11. ‘Bar’ is the unit of A.     temperature B.     heat C.     atmospheric pressure D.     current Answer

A.     746 watts B.     748 watts C.     756 watts D.     736 watts Answer & Explanation Answer:

1. What is the unit for measuring the amplitude of a sound? A.     Decibel    B.     Coulomb C.   

61. Which of the following metals remain in liquid for under normal conditions? A.     Radium    B.     Zinc C.

56. Water is a good solvent of ionic salts because A.     it has a high specific heat B.   

51. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the

46. In fireworks, the green flame is produced because of A.     sodium    B.     barium C.     mercury    D.

41. What is laughing gas? A.     Nitrous Oxide B.     Carbon monoxide C.     Sulphur dioxide D.     Hydrogen

36. Which of the following was to be discovered first in the chromospheres of the sun? A.     Krypton    B.

26. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the

31. Potassium nitrate is used in A. medicine B. fertiliser C. salt D. glass Answer & Explanation Answer: Option B

26. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the

21. When an iron nail gets rusted, iron oxide is formed A.     without any change in the weight of

16. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

11. Bromine is a A.     black solid B.     red liquid C.     colourless gas D.     highly inflammable

6. Chemical formula for water is A.     NaAlO2    B.     H2O C.     Al2O3    D.     CaSiO3 Answer &

1. Brass gets discoloured in air because of the presence of which of the following gases in air? A.   

21. When an iron nail gets rusted, iron oxide is formed A.     without any change in the weight of

16. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

11. Bromine is a A.     black solid B.     red liquid C.     colourless gas D.     highly inflammable