📊 Physics
Q. The density of water is 1 g/cc. This is strictly valid at
  • (A) 0°C
  • (B) 4°C
  • (C) 25°C
  • (D) 100°C
💬 Discuss
✅ Correct Answer: (B) 4°C
📊 Physics
Q. Specific gravity is defined as the ratio of
  • (A) Density of the substance to the density of water
  • (B) Density of the substance to the density of water at 0°C
  • (C) Density of water at 4°C to the density of the substance
  • (D) Density of the substance to the density of water at 4°C
💬 Discuss
✅ Correct Answer: (A) Density of the substance to the density of water
📊 Physics
Q. The cause for the Tsunami, as deduced by the seismologists, is
  • (A) Gravitational pull of the moon
  • (B) Low pressure trough in the ocean
  • (C) Deformation of sea floor and vertical displacement of water
  • (D) Sudden change in the monsoon wind
💬 Discuss
✅ Correct Answer: (C) Deformation of sea floor and vertical displacement of water

Explanation: Seismologists say only earthquakes measuring greater than 7.0 on the Richter scale can produce a major tsunami. The friction between two slow-moving plates of the Earth's crust creates vast amounts of seismic energy which is released in the form of an earthquake.

📊 Physics
Q. The instrument for measuring intensity of earthquakes is called
  • (A) Ediograph
  • (B) Pantagraph
  • (C) Ergograph
  • (D) Seismograph
💬 Discuss
✅ Correct Answer: (D) Seismograph
📊 Physics
Q. Sound waves do not show the phenomenon of
  • (A) Refraction
  • (B) Interference
  • (C) Diffraction
  • (D) Polarisation
💬 Discuss
✅ Correct Answer: (D) Polarisation
📊 Physics
Q. Speed of sound is maximum in which among the following?
  • (A) Gases
  • (B) Vaccum
  • (C) Liquids
  • (D) Solids
💬 Discuss
✅ Correct Answer: (D) Solids
📊 Physics
Q. What is the full form of "RADAR" ?
  • (A) Radio Detecting and Ranging
  • (B) Region Device and Ranging
  • (C) Radio Detect and Rangs
  • (D) Radio Device and Ranging
💬 Discuss
✅ Correct Answer: (A) Radio Detecting and Ranging
📊 Physics
Q. When light enters a closed room through a small hole in the door, the image of an outside building appears as inverted on the opposite wall. This is because
  • (A) The hole acts as a convex lens
  • (B) The hole acts as a concave lens
  • (C) Of rectilinear propagation of light
  • (D) Light takes curvature at the edges of the hole
💬 Discuss
✅ Correct Answer: (D) Light takes curvature at the edges of the hole
📊 Physics
Q. An energy source will supply a constant current into the load if its internal resistance is
  • (A) Very large as compared to the load resistance
  • (B) Non-zero but less than the resistance of the load
  • (C) Zero
  • (D) Equal to the resistance of the load
💬 Discuss
✅ Correct Answer: (C) Zero
📊 Science
Q. Containers for carrying strong acids are made of
  • (A) lead
  • (B) copper
  • (C) brass
  • (D) platinum
💬 Discuss
✅ Correct Answer: (A) lead

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