1
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Assertion (A) : Higher the range, lower is the resistance of an ammeter.

Reason (R) : To increase the range of an ammeter additional shunt is added in series to it.
A
Both (A) & (R) are true and (R) is correct explanation of (A).
B
Both (A) & (R) are true and (R) is not correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false and (R) is also false.
2
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Assertion (A) : A step-up transformer cannot be used as a step-down transformer.

Reason (R) : A transformer works only in one direction.
A
Both (A) & (R) are true and (R) is correct explanation of (A).
B
Both (A) & (R) are true and (R) is not correct explanation of (A).
C
(A) is true but (R) is false.
D
(A) is false and (R) is also false.
3
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Equipotentials at a large distance from a collection of charges whose total sum is not zero are -
A
spheres
B
planes
C
ellipsoids
D
paraboloids
4
CBSE 12th Physics (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+0.77
-0
Four charges $$-$$q, $$-$$q, +q and +q are placed at the corners of a square of side 2 L is shown in figure. The electric potential at point A midway between the two charges +q and +q is -

A
$${1 \over {4\pi { \in _0}}}{{2q} \over L}\left( {1 - {1 \over {\sqrt 5 }}} \right)$$
B
$${1 \over {4\pi { \in _0}}}{{2q} \over L}\left( {1 + {1 \over {\sqrt 5 }}} \right)$$
C
$${1 \over {4\pi { \in _0}}}{q \over {2L}}\left( {1 - {1 \over {\sqrt 5 }}} \right)$$
D
zero
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