GK - Physics
1.
Metals are good conductors of electricity because
Answer
Metals are good conductor of electricity because they have very large number of free valance electrons to conduct electricity.
Answer :
Option AExplanation :
Metals are good conductor of electricity because they have very large number of free valance electrons to conduct electricity.
2.
On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Answer
The boat will remain at rest as force exerted by the air of fan on the boat is internal and for motion external force is required.
Answer :
Option BExplanation :
The boat will remain at rest as force exerted by the air of fan on the boat is internal and for motion external force is required.
3.
Which type of radiation has the lowest penetrating ability?
Answer
The alpha(α) particle has the least penetrating power since it is the largest and slowest emission. It can be blocked by a sheet of paper or a human hand.
Answer :
Option AExplanation :
The alpha(α) particle has the least penetrating power since it is the largest and slowest emission. It can be blocked by a sheet of paper or a human hand.
4.
Sound waves in air are
Answer
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.
Answer :
Option BExplanation :
Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.
5.
The image of our face in a plane mirror is
Answer
The image formed by a plane mirror is a virtual, laterally inverted image at same distance from the mirror that of object and of same size of object.
Answer :
Option DExplanation :
The image formed by a plane mirror is a virtual, laterally inverted image at same distance from the mirror that of object and of same size of object.
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