πŸ“Š Physics
Q. On a rainy day, small oil films on water show brilliant colours. This is due to
  • (A) dispersion
  • (B) interference
  • (C) diffraction
  • (D) polarization
πŸ’¬ Discuss
βœ… Correct Answer: (B) interference

Explanation: On a rainy day, small oil films on water show brilliant colours. This is due to Interference.
Interference is a phenomenon in which two waves superimpose to form a resultant wave of greater, lower or same amplitude.

πŸ“Š Physics
Q. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
  • (A) Move towards A
  • (B) Move towards B
  • (C) Move at right angles to the line joining A and B
  • (D) Remain at rest
πŸ’¬ Discuss
βœ… Correct Answer: (B) Move towards B
πŸ“Š Physics
Q. Materials for rain-proof coats and tents owe their water-proof properties to
  • (A) surface tension
  • (B) viscosity
  • (C) specific gravity
  • (D) elasticity
πŸ’¬ Discuss
βœ… Correct Answer: (A) surface tension

Explanation: The material of rain proof coats have the property of not minimizing the surface tension which will tend the water molecule to be in its drop form.

πŸ“Š Physics
Q. RADAR is used for:
  • (A) receiving a signals in a radio receiver.
  • (B) locating submerged submarines.
  • (C) locating geostationary satellites.
  • (D) detecting and locating the position of objects such as Aeroplanes.
πŸ’¬ Discuss
βœ… Correct Answer: (D) detecting and locating the position of objects such as Aeroplanes.

Explanation: A radar system consists of a transmitter producing electromagnetic waves in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver and processor to determine properties of the objects.



Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain.



Radio waves from the transmitter reflect off the object and return to the receiver, giving information about the object's location and speed.

πŸ“Š Physics
Q. The image formed in a compound microscope is
  • (A) erect
  • (B) inverted
  • (C) sometimes erect, sometimes inverted
  • (D) none
πŸ’¬ Discuss
βœ… Correct Answer: (B) inverted
πŸ“Š Physics
Q. The lens used in a simple microscope is
  • (A) Concave
  • (B) Convex
  • (C) Cylindrical
  • (D) None
πŸ’¬ Discuss
βœ… Correct Answer: (B) Convex
πŸ“Š Physics
Q. The S. I. unit of refractive index is
  • (A) meter
  • (B) cm
  • (C) watt
  • (D) no unit
πŸ’¬ Discuss
βœ… Correct Answer: (D) no unit
πŸ“Š Physics
Q. The liquid metal is
  • (A) Bismuth
  • (B) Magnesium
  • (C) Mercury
  • (D) Sodium
πŸ’¬ Discuss
βœ… Correct Answer: (C) Mercury
πŸ“Š Physics
Q. Endothermic reactions are those in which
  • (A) Heat is evolved
  • (B) Heat is absorbed
  • (C) Temperature increases
  • (D) Light is produced
πŸ’¬ Discuss
βœ… Correct Answer: (B) Heat is absorbed
πŸ“Š Physics
Q. Which colour of light is deviated least
  • (A) Red
  • (B) Blue
  • (C) Violet
  • (D) Green
πŸ’¬ Discuss
βœ… Correct Answer: (A) Red

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