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9th Grade > Physics

WORK AND ENERGY MCQs

Total Questions : 131 | Page 6 of 14 pages
Question 51. As the rain falls, the potential energy changes to
  1.    thermal energy
  2.    chemical energy
  3.    kinetic energy
  4.    nuclear energy
 Discuss Question
Answer: Option C. -> kinetic energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 52. If the kinetic energy of a body of mass 2 kg is 25 J. Its speed is
  1.    25 ms-1
  2.    15 ms-1
  3.    5 ms-1
  4.    2.5 ms-1
 Discuss Question
Answer: Option C. -> 5 ms-1
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 53. The energy present in a body due to its height is called
  1.    gravitational kinetic energy
  2.    gravitational potential energy
  3.    altitude energy
  4.    gravitational energy
 Discuss Question
Answer: Option B. -> gravitational potential energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 54. The vibrating diaphragm of a drum in the form of
  1.    kinetic energy
  2.    sound energy
  3.    chemical energy
  4.    nuclear energy
 Discuss Question
Answer: Option B. -> sound energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 55. In Einstein's mass-energy equation, c is the
  1.    speed of sound
  2.    speed of light
  3.    speed of electron
  4.    speed of Earth
 Discuss Question
Answer: Option B. -> speed of light
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 56. Dams are used for generation of
  1.    mechanical energy
  2.    nuclear energy
  3.    electrical energy
  4.    heat energy
 Discuss Question
Answer: Option C. -> electrical energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 57. The energy coming directly from magma is called
  1.    mechanical energy
  2.    geothermal energy
  3.    heat energy
  4.    electrical energy
 Discuss Question
Answer: Option B. -> geothermal energy
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 58. The efficiency of a solar cell is
  1.    0.8
  2.    0.35
  3.    0.55
  4.    0.03
 Discuss Question
Answer: Option D. -> 0.03
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 59. During interconversion of energy the total energy
  1.    remains constant
  2.    increases
  3.    decreases
  4.    becomes zero
 Discuss Question
Answer: Option A. -> remains constant
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 60. The value of the speed of light is
  1.    3 × 10⁵ ms-¹
  2.    5 × 10⁵ ms-¹
  3.    3 × 10⁹ ms-¹
  4.    3 × 10⁸ ms-¹
 Discuss Question
Answer: Option D. -> 3 × 10⁸ ms-¹
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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