Class 10 Science â Important MCQS - 1
49. Which gas is used in photosynthesis ? āĻĒā§ā§°āĻāĻžāĻļ-āĻ¸āĻāĻ¸ā§āĻ˛ā§āĻˇāĻŖāĻ¤ āĻā§āĻ¨āĻā§ āĻā§āĻ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻšāĻ¯āĻŧ ?
a) Oxygen | b) Carbon dioxide | c) Nitrogen | d) Hydrogen
Ans: Carbon dioxide
Explanation: Plants use COâ to make food. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻāĻĻā§āĻāĻŋāĻĻā§ āĻāĻžāĻĻā§āĻ¯ āĻŦāĻ¨āĻžāĻŦāĻ˛ā§ āĻāĻžā§°ā§āĻŦāĻ¨ āĻĄāĻžāĻ āĻ
āĻā§āĻ¸āĻžāĻāĻĄ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°ā§āĨ¤
50. SI unit of electric potential is: āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻŦāĻŋāĻā§ąā§° SI āĻāĻāĻ āĻāĻŋ ?
a) Volt | b) Ampere | c) Ohm | d) Watt
Ans: Volt
Explanation: Electric potential is measured in volt. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻŦāĻŋāĻĻā§āĻ¯ā§ā§ āĻŦāĻŋāĻā§ą āĻāĻ˛ā§āĻāĻ¤ āĻŽāĻžāĻĒāĻž āĻšāĻ¯āĻŧāĨ¤
51. Human breathing organ is: āĻŽāĻžāĻ¨ā§ą āĻĻā§āĻšā§° āĻļā§āĻŦāĻžāĻ¸-āĻĒā§ā§°āĻļā§āĻŦāĻžāĻ¸ āĻ āĻāĻ āĻā§āĻ¨āĻā§ ?
a) Heart | b) Lungs | c) Liver | d) Kidney
Ans: Lungs
Explanation: Lungs help in breathing. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻĢā§āĻ¸āĻĢā§āĻ¸ā§ āĻļā§āĻŦāĻžāĻ¸-āĻĒā§ā§°āĻļā§āĻŦāĻžāĻ¸ āĻā§°ā§āĨ¤
52. Which planet is known as the “Red Planet” ? āĻā§āĻ¨āĻā§ āĻā§ā§°āĻšāĻ “ā§°āĻāĻž āĻā§ā§°āĻš” āĻŦā§āĻ˛āĻŋ āĻā§ā§ąāĻž āĻšāĻ¯āĻŧ ?
a) Earth | b) Mars | c) Jupiter | d) Saturn
Ans: Mars
Explanation: Mars looks red due to iron oxide. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ˛ā§āĻš āĻ
āĻā§āĻ¸āĻžāĻāĻĄā§° āĻŦāĻžāĻŦā§ āĻŽāĻā§āĻāĻ˛ āĻā§ā§°āĻš ā§°āĻāĻž āĻĻā§āĻāĻž āĻ¯āĻžāĻ¯āĻŧāĨ¤
53. What is the powerhouse of the cell ? āĻā§āĻˇā§° āĻļāĻā§āĻ¤āĻŋāĻā§° āĻā§āĻ¨āĻā§ ?
a) Nucleus | b) Mitochondria | c) Ribosome | d) Cytoplasm
Ans: Mitochondria
Explanation: Mitochondria produce energy (ATP). āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻŽāĻžāĻāĻā§āĻ’āĻŖā§āĻĄā§ā§°āĻŋāĻ¯āĻŧāĻžāĻ āĻļāĻā§āĻ¤āĻŋ āĻā§āĻĒāĻžāĻĻāĻ¨ āĻā§°ā§āĨ¤
54. Law of gravitation was given by: āĻŽāĻšāĻžāĻā§°ā§āĻˇāĻŖā§° āĻ¨āĻŋāĻ¯āĻŧāĻŽ āĻā§āĻ¨ā§ āĻĻāĻŋāĻāĻŋāĻ˛ ?
a) Isaac Newton b) Galileo Galilei c) Albert Einstein d) Johannes Kepler
Ans: Isaac Newton
Explanation: Newton gave the law of universal gravitation. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ¨āĻŋāĻāĻāĻ¨ā§ āĻŽāĻšāĻžāĻā§°ā§āĻˇāĻŖā§° āĻ¨āĻŋāĻ¯āĻŧāĻŽ āĻĻāĻŋāĻāĻŋāĻ˛āĨ¤
55. Which acid is found in lemon ? āĻ˛ā§āĻŦā§āĻ¤ āĻā§āĻ¨āĻā§ āĻāĻāĻŋāĻĄ āĻĒā§ā§ąāĻž āĻ¯āĻžāĻ¯āĻŧ ?
a) HCl | b) HâSOâ | c) Citric acid | d) Nitric acid
Ans: Citric acid
Explanation: Lemon is rich in citric acid. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻ˛ā§āĻŦā§āĻ¤ āĻāĻŋāĻā§ā§°āĻŋāĻ āĻāĻāĻŋāĻĄ āĻĨāĻžāĻā§āĨ¤
56. Base turns red litmus paper: āĻā§āĻˇāĻžā§°ā§ ā§°āĻāĻž āĻ˛āĻŋāĻāĻŽāĻžāĻ āĻāĻžāĻāĻāĻ āĻā§āĻ¨ā§āĻā§ āĻĒā§°āĻŋāĻŦā§°ā§āĻ¤āĻ¨ āĻā§°ā§ ?
a) Blue | b) Red | c) Pink | d) No change
Ans: Blue
Explanation: Bases turn red litmus blue. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻā§āĻˇāĻžā§°ā§ ā§°āĻāĻž āĻ˛āĻŋāĻāĻŽāĻžāĻ āĻ¨ā§āĻ˛āĻž āĻā§°ā§āĨ¤
57. Form of energy stored in food is: āĻāĻžāĻĻā§āĻ¯āĻ¤ āĻā§āĻ¨ āĻĒā§ā§°āĻāĻžā§°ā§° āĻļāĻā§āĻ¤āĻŋ āĻĨāĻžāĻā§ ?
a) Kinetic | b) Potential | c) Chemical | d) Thermal
Ans: Chemical energy
Explanation: Food stores chemical energy. āĻŦā§āĻ¯āĻžāĻā§āĻ¯āĻž: āĻāĻžāĻĻā§āĻ¯āĻ¤ ā§°āĻžāĻ¸āĻžāĻ¯āĻŧāĻ¨āĻŋāĻ āĻļāĻā§āĻ¤āĻŋ āĻ¸āĻā§āĻāĻŋāĻ¤ āĻĨāĻžāĻā§āĨ¤