M.C.Q-[Phy-1M]

MCQ 11 Mark

One end of a wire carrying current in the downward direction is placed in a trough containing mercury (so that the direction of force experienced by it is clearly visible). Two pole pieces N and S are placed on each side as shown in the diagram (so as to provide uniform magnetic field).

What is the direction of force experienced by the wire?

A
Away from the observer
B
Constant position
C
Upward from the observer
✓
Towards the observer

Answer

Correct option: D.

Towards the observer

(D) Towards the observer
Explanation:
As per Fleming's left hand rule , Direction of force is towards the observer.

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MCQ 21 Mark

What is the observed colour of sky as seen from the moon surface?

A
None of these.
✓
Black
C
Blue
D
Red

Answer

Correct option: B.

Black

(B) Black
Explanation:
The sky appears blue due to the scattering of the blue colour by the earth's atmosphere. In moon there is no atmosphere hence nothing to scatter light. Thus, the sky appears dark or black as seen from the moon surface.

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Science M.C.Q-[Phy-1M]

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