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Figure 1
A closed surface in vacuum encloses charges and . The total electric flux emerging out of the…
(A)(i)[1.0]
A closed surface in vacuum encloses charges $-q$ and $+3q$. The total electric flux emerging out of the surface is:
- (a)Zero
- (b)$\frac{2q}{\varepsilon_0}$
- (c)$\frac{3q}{\varepsilon_0}$
- (d)$\frac{4q}{\varepsilon_0}$
(A)(ii)[1.0]
What is the angle of dip at a place where the horizontal component ($B_H$) and vertical component ($B_V$) of earth’s magnetic field are equal:
- (a)$130^\circ$
- (b)$60^\circ$
- (c)$45^\circ$
- (d)$90^\circ$
(A)(iii)[1.0]
A beam of light is incident at the polarizing angle of $35^\circ$ on a certain glass plate. The refractive index of the glass plate is:
- (a)$\sin 35^\circ$
- (b)$\tan 35^\circ$
- (c)$\tan 55^\circ$
- (d)$\sin 55^\circ$
(A)(iv)[1.0]
In a gamma ray emission from nucleus:
- (a)only the number of protons change.
- (b)the number of protons and neutrons, both change.
- (c)there is no change in the number of protons and the number of neutrons.
- (d)only the number of neutrons change.
(A)(v)[1.0]
The energy associated with light of which of the following colours is minimum:
- (a)violet
- (b)red
- (c)green
- (d)yellow
(B)(i)[1.0]
Define equipotential surface.
(B)(ii)[1.0]
Calculate the net emf across A and B shown in Figure 1 below:
(B)(iii)[1.0]
Why are the pole pieces of a horseshoe magnet in a moving coil galvanometer made cylindrical in shape?
(B)(iv)[1.0]
What is the value of power factor for a pure resistor connected to an alternating current source?
(B)(v)[1.0]
What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double Slit experiment?
(B)(vi)[1.0]
Define critical angle for a given medium.
(B)(vii)[1.0]
Name the series in the atomic spectra of the hydrogen atom that falls in the ultra violet region.
Answer
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From ISC 2019 Physics Paper 1, question 1.