physics

A resistor connected to a 12V battery draws a current of 2A. The energy dispatched in the resistor in 5 minutes is?

A. 3,600J B. 6,000J C. 7,200J D. 14,400J Correct Answer: Option C - 7,200J Explanation Power drawn by the resistor…

5 years ago

The photo cell works on the principle of the?

A. Voltaic cell B. Emission of electron by incident radiation C. Emission of protons by incident radiation D. Photographic plate…

5 years ago

If the focal length of a camera is 20cm; the distance from the film at which the lens must be set to produce a sharp image of 100cm away is?

A. 17cm B. 20cm C. 25cm D. 100cm Correct Answer: Option A = 17cm Explanation F = 20cm V =…

5 years ago

Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to?

A. Heat dissipation B. Production of eddy currents C. Excessive current discharge D. Excessive voltage discharge Correct Answer: Option A…

5 years ago

Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?

A. Pair of calipers B. Meter rule C. Micrometer screw gauge D. Tape rule Correct Answer: Option C - Micrometer…

5 years ago

An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is?

A. 25.2N B. 17.4N C. 12.6N D. 9.0N Correct Answer: Option B - 17.4N Explanation Weight of water displaced =…

5 years ago

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m/s. Determine the magnitude of the resulting impulse?

A. 20.0kgms−¹ B. 10.0kgms−¹ C. 5.0kgms−¹ D. 2.5kgms−¹ Correct Answer: Option B - 10.0kgms−¹ Explanation Impulse = Change in momentum…

5 years ago

Palm oil from a bottle flows out more easily after it has been heated because the?

A. Molecules are given energy during the heating B. Friction between oil layers is reduced C. Oil molecules force each…

5 years ago

Which of the following is the dimension of pressure?

A. ML−¹T−² B. MLT−² C. ML²T³ D. ML−³ Correct Answer: Option A - ML−¹T−² Explanation Pressure = Force/Area ML−¹T−²

5 years ago