Q: Decibel is the unit used for

A: intensity of light

B: intensity heat

C: intensity of sound

D: frequency of radio wave



Correct Option: C  [ intensity of sound ]

Remark:


Q: Which of the following micro-organism causes diseases like polio and chicken pox?

A: Bacteria

B: Protozoa

C: Algae

D: Virus



Correct Option: D  [ Virus ]

Remark:


Q: Which of the following is not a property of acids ?

A: All acids have sour taste

B: All acids are corrosive in nature

C: For acidic solutions pH = <7

D: Acids turn red litmus to blue



Correct Option: D  [ Acids turn red litmus to blue ]

Remark:


Q: Which of the following retains the information when the power to the system is shut down?

A: CPU

B: ROM

C: RAM

D: DIMM



Correct Option: B  [ ROM ]

Remark:


Q: If a liquid is heated in space under no gravity, the transfer of heat will take place by process of:

A: conduction

B: convection

C: radiation

D: cannot be heated in the absence of gravity



Correct Option: C  [ radiation ]

Remark:


Q: RADAR is used for

A: locating submerged submarines

B: receiving signals in a radio receiver

C: locating geostationary satellites

D: detecting and locating the position of objects such as aeroplane



Correct Option: D  [ detecting and locating the position of objects such as aeroplane ]

Remark:


Q: Atom bomb is based on:

A: Chemical reaction

B: Nuclear fission

C: Nuclear fusion

D: Atomic collision



Correct Option: B  [ Nuclear fission ]

Remark:


Q: Helium is preferred to hydrogen in air balloons because it:

A: is cheaper

B: is less dense

C: has greater lifting power

D: does not form an explosive mixture with air



Correct Option: D  [ does not form an explosive mixture with air ]

Remark:


Q: Organic farming does not include:

A: green manures

B: chemical fertilizers

C: crop rotation

D: compost and farmyard manures



Correct Option: B  [ chemical fertilizers ]

Remark:


Q: Which is the respiratory organ of fish?

A: Ears

B: Gills

C: Skin

D: Lungs



Correct Option: B  [ Gills ]

Remark:
1...