Physics - Study Mode

[#621] Copper wires are generally used for electrical power transmission instead of iron wire because :
Correct Answer

(C) Copper is a better conductor of electricity than iron

Explanation

Solution: Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.

[#622] The earth-wire of a cable is connected to
Correct Answer

(B) The fuse of the appliance

Explanation

Solution: The earth-wire of a cable is connected to the fuse of the appliance.

[#623] Lightning is caused due to
Correct Answer

(B) Electric discharge

Explanation

Solution: Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds.

[#624] A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
Correct Answer

(C) Remain the same

Explanation

Solution: When a piece of ice is placed in a beaker containing water, some of its portion remains out of the water level. Since the volume of ice is greater than the water hence after melting the volume of the piece will decrease and the water level will remain the same.

[#625] The magnitude of buoyant force depends on the ________ of the fluid.
Correct Answer

(D) Density

Explanation

Solution: The magnitude of buoyant force depends on the density of the fluid.