physics

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

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

5 years ago

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

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

5 years ago

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

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

5 years ago

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

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

5 years ago

A room is heated by means of a charcoal fire; an occupant of the room standing away from the fire is warmed mainly by?

A. Convection B. Radiation C. Conduction D. Reflection Correct Answer: Option B - Radiation Explanation Radiation refers to the transmission…

5 years ago

Which of the following is not a product of nuclear fusion?

A. X – ray B. Y –ray C. α – particles D. neutron Correct Answer: Option A - X –…

5 years ago

The process by which protons are converted into helium atoms with a tremendous release of energy is called?

A. thermionic emission B. nuclear fission C. thermonuclear fusion D. photoelectric emission Correct Answer: Option C - thermonuclear fusion Explanation…

5 years ago

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules.

A. Transitional Motion B. Rotational Motion C. Brownian Motion D. Oscillatory Motion Correct Answer: Option C - Brownian Motion Explanation…

5 years ago

Water of mass 150g at 60°c is added to 300g of water at 20°c and the mixture is well stirred. Calculate the temperature of the mixture. (neglect heat losses to the surroundings)

A. 33°C B. 40°C C. 25°C D. 10°C Correct Answer: Option A - 33°C Explanation Water 1 => M =…

5 years ago

Mercury which is spilled onto a glass surface forms ball-like shapes because?

A. Mercury is a metal B. The cohesive force between its molecules is greater than the adhesive force between mercury…

5 years ago
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