Physics - Study Mode

[#1346] The spokes used in the wheel of a bicycle increase its
Correct Answer

(A) Moment of inertia

Explanation

Solution: A spoke is one of some number of rods radiating from the center of a wheel (the hub where the axle connects), connecting the hub with the round traction surface. Metal spokes used in bicycles also increase the moment of inertia.

[#1347] It is difficult to cook rice
Correct Answer

(A) At the top of a mountain

Explanation

Solution: At high altitude pressure is low and therefore the boiling point is also low. In this case, water starts boiling below its boiling point but rice cooks at 100. So, it is difficult to cook rice at high altitudes.

[#1348] Energy per unit volume is dimensionally equal to
Correct Answer

(A) Pressure

Explanation

Solution: Energy per unit volume is dimensionally equal to pressure.

[#1349] To open a door easily, the handle should be fixed
Correct Answer

(D) None of these

Explanation

Solution: None of the above

[#1350] Water boils at a lower temperature on the hills because
Correct Answer

(C) There is a decrease in air pressure on the hills

Explanation

Solution: The boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure. A liquid boils when its vapour pressure exceeds the local total pressure. As the atmospheric pressure drops, the Vapour pressure increases more than the local pressure at an even lower temperature.