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Questions in physics

[Jawaban] 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

[Jawaban] A particle is projected vertically upwards from its ground with an initial speed of [tex]$30 ms^{-1}$[/tex]. Calculate the: 1. Maximum height reached by the particle. 2. Time taken by the particle to return to the ground. 3. Time taken for the particle to attain a height of 4 m above its ground. Take g = [tex]$10 ms^{-2}$[/tex]

[Jawaban] Ana exerts a force of 20 N on a volleyball that has a mass of 0.15 kg. What is the force that the volleyball exerts on Ana? A. 0.15 N B. 20 N C. 19.85 N D. 20.15 N

[Jawaban] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Jawaban] A car is moving at a constant speed along a straight line. Which statement is true about the forces acting on the car? A. The net force acting on the car from all directions is zero. B. The net force acting on the car is greater than the car's weight. C. The net force acting on the car is in the direction of the car's motion. D. The net force acting on the car is in the opposite direction of the car's motion.

[Jawaban] What is the mass of a crate if a force of 200 N causes it to accelerate at [tex]$8 m / s ^2$[/tex]? (Formula: [tex]$F= ma$[/tex])

[Jawaban] An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?

[Jawaban] Which will a positively charged object attract? A. an object that has a negative charge B. an object that has a smaller positive charge C. an object that has no charge D. an object that has a larger positive charge

[Jawaban] In which direction does the electric field point at a position directly west of a negative charge? A. West B. East C. North D. South

[Jawaban] What is the electric force acting between two charges of 0.0072 C and -0.0060 C that are 0.0040 m apart? Use [tex]F_0=\frac{k q_1 q_2}{r^2}[/tex] and [tex]k =9.00 \times 10^9 N \cdot m ^2 / C ^2[/tex]. A. [tex]$-9.7 \times 10^7 N$[/tex] B. [tex]$2.4 \times 10^{-10} N$[/tex] C. [tex]$9.7 \times 10^7 N$[/tex] D. [tex]$-2.4 \times 10^{-10} N$[/tex]