60. What is the speed of light in a vacuum?
a. 300,000 km/s
b. 3,000,000 km/s
c. 3x10 m/s
d. 3x10 m/s
61. Which of the following types of waves require a medium to travel?
a. Light waves
b. Sound waves
c. Radio waves
d. X-ray
62. __________ is the term for binding of light as it passes one medium to another.
a. Reflection
b. Refraction
c. Diffraction
d. Total internal reflection
63. __________ is the unit of measurement for force.
a. Neuton (N)
b. Joule (J)
c. Kilogram (kg)
d. Meter (m)
64. A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
a. exert force on the ball
b. increase force of ball on hands
c. increase energy to hit ball
d. decrease the rate of change of momentum
65. Which of the following is an example of a vector quantity?
a. Mass
b. Speed
c. Velocity
d. Time
66. Choose the best option that will help the nation to control global warming.
a. Burning of fuel
b. Forestation
c. Urbanization
d. Increasing human population
67. Two bar magnets are placed near each other such that the north seeking poles of both magnets are beside each other. Also two bar magnets near each other so as to have north seeking pole of one beside the south seeking pole of each other. The observation shows that
a north-north seeking pole attract
b. north-north seeking pole attract
c. north-north seeking pole attract
d. north-north seeking pole attract
68. What is the process of growing two or more crops in a definite pattern?
a. Inter-cropping
b. Crop rotation
c. Mixed cropping
d. Organic cropping
69. Pasturage is related to
a. fishery
b. cattle
c. agriculture
d. sericulture
70. Nitrogen, phosphorous and potassium are examples of
a. fertilizer
b. micro-nutrients
c. manure
d. nutrients
71. Using fertilizer in farming is an example of
a. high cost farming
b. low cost farming
c. crop farming
d. farming
72. Octopus, prawn and crab are examples of
a. marine fishes
b. fresh-water fishes
c. finned fishes
d. shell fishes
Answer (2)
The answers provided cover various physics concepts, including light speed, wave types, forces, magnet interactions, and agricultural practices. Each answer is directly linked to fundamental principles of physics and related fields. Understanding these principles is essential for grasping broader scientific concepts. ;
The questions cover key concepts in physics and agriculture, including the speed of light in a vacuum (300,000 km/s), the necessity of a medium for some waves (only sound waves), and basic units and principles related to force and energy. Each answer is connected to fundamental scientific principles important for understanding the broader topics in these fields.
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