12th Standard Syllabus & Materials
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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Physics Test1.
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 \(\times\) 10-2 C and 5 \(\times\) 10-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is
3 \(\times\) 10-2 C
4 \(\times\) 10-2 C
1 \(\times\) 10-2 C
2 \(\times\) 10-2 C
2.
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
Capacitance
Charge
Voltage
Energy density
3.
Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.
8.80 x 10-17 J
-8.80 x 10-17 J
4.40 x 10-17 J
5.80 x 10-17 J
4.
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is _____.
10 V
-20 V
+20 V
-10 V
5.
Two identical conducting balls having positive charges q1 and q2 are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
less than before
same as before
more than before
zero
1.
Q = q1 + q2 = 4 x 10-2C
\(q_{2f}=Q[\frac{r_2}{r_1+r_2}]\)
= 4 x 10-2 \([\frac{3}{4}]\)
q2f = 3 x 10-2 C
2.
Energy density uE \(=\frac{U}{volume}\)
If A' = 2A d ' = 2d
Then V ' = 2A x 2d = 4Ad = 4V
Then volume would be increased. So, energy density will change.
3.
W = qV
V = 7 - (-4) = 11 V
q = ne = 50 x 1.6 x 10-19 = 8 x 10-18C
W = 8 x 10-18 x 11 = 88 x 10-18 = 8.8 x 10-17]
4.
\(\vec {E}\) = 10x\(\hat{i},\) when x = 2 m
\(\vec {E}\) = 10 x 2 x \(\hat{i}\) = 20\(\hat{i}\)
Since, \(E=\frac{-dV}{dx}\therefore V=+20 V\)
5.
Force ∝ charge
After the separation, the magnitude of charge will be increased. So the force will be more than before.
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