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

5 years ago

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

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

5 years ago

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

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

5 years ago

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

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

5 years ago

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

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)

5 years ago

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

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

5 years ago

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

A 40W instrument has a resistance 90 ohms. On what voltage should it be operated normally?

5 years ago

A. 60V B. 150V C. 225V D. 360V Correct Answer: Option A - 60V Explanation P = 40W R =…

Which of the following is an essential physical property of the wires uses for making fuses?

5 years ago

A. Low density B. Hypothermal conductivity C. Low electrical resistivity D. Low melting point Correct Answer: Option D - Low…

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m; how far away is the hill?

5 years ago

A. 330.0m B. 335.4m C. 660.0m D. 670.8m Correct Answer: Option B - 335.4m Explanation Recall V = F ×…

A car traveled at a uniform speed of 100km/h; spends 15m moving from point A to point B along its route. The distance between A and B is?

5 years ago

A. 50km B. 25km C. 15km D. 10km Correct Answer: Option B - 25km

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