A boy observes a piece of stone at the bottom of a river 6.0m deep. If he looks from the surface of the river. What is the apparent distance of the stone from him? [Refractive Index of Water = 4/3]

5 years ago

A. 8.0m B. 5.5m C. 5.0m D. 4.5m Correct Answer: Option D = 4.5m Explanation Refractive Index = Real Depth/App.…

Which of the conditions below are necessary to produce interference fringes?

5 years ago

I. Coherence II. Same frequency III. Same wavelength IV. Same Intensity A. I and III B. I, II and IV…

A quantity of water at 0°C is heated to about 30°C. At each degree rise in temperature, its density will?

5 years ago

A. rise steadily B. fall steadily C. fall then rise D. rise then fall Correct Answer: Option D - rise…

Total internal reflection occurs when light moves from?

5 years ago

A. a dense medium to a less dense medium B. air to water C. water to glass D. a less…

Which combination of the above is true of sliding friction?

5 years ago

I. The frictional force is independent of the area of the surfaces in conduct II. The frictional force depends on…

A rope is being used to pull a mass of 10kg vertically upward. Determine the tension in the rope if starting from rest; the mass acquires a velocity of 4ms‾¹ in 8s [g = 10ms−²2]

5 years ago

A. 5N B. 50N C. 95N D. 105N Correct Answer: Option D - 105N Explanation Tension = Force of gravity…

A stream is flowing at 0.75ms‾¹ and a boat heading perpendicular for the stream landed at the opposite bank at an angle of 30°. Calculate the velocity of the boat.

5 years ago

A. 1.50ms‾¹ B. 1.00ms‾¹ C. 0.86ms‾¹ D. 0.65ms‾¹ Correct Answer: Option C - 0.86ms‾¹ Explanation Let the velocity of the…

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F. If the stone leaves with a velocity of 40m/s, the value of F is?

5 years ago

A. 4.0 x 102N B. 2.0 x 103N C. 4.0 x 103N D. 4.0 x 104N Correct Answer: Option C…

What is the angle of dip at the magnetic equator?

5 years ago

A. 45° B. 0° C. 90° D. 180° Correct Answer: Option B = 0° Explanation The angle of dip is…

A bread toaster uses a current of 4A when plugged in a 240V line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster?

5 years ago

A. 5.76 x 104J B. 1.60 x 104J C. 3.60 x 103J D. 1.60 x 102J Correct Answer: Option A…

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