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

5 years ago

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

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

5 years ago

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

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?

5 years ago

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

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?

5 years ago

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…

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

5 years ago

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

Which of the following is the dimension of pressure?

5 years ago

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

To keep a vehicle moving at a constant speed V requires power P from the engine. The force provided by the engine is?

5 years ago

A. P/V B. (½)V C. P/V D. PV² Correct Answer: Option A - PV Explanation P = F × S1…

The friction which exist between two layers of liquid in relative motion is called?

5 years ago

A. Capillary B. Surface C. Viscosity D. Cohesion Correct Answer: Option C - Viscosity Explanation Viscosity, resistance of a fluid…

Which of the following phenomena cannot be explained by the molecular theory of matter?

5 years ago

A. Conduction B. Convection C. Expansion D. Radiation Correct Answer: Option D - Radiation Explanation Conduction: the flow of internal…

For what values of F and θ will the forces as shown in the diagram below be in equilibrium?

5 years ago

A. 60N and 60° B. 60N and 30° C. 20√3 N and 60° D. 20√3N and 30° Correct Answer: Option…