‹ Back to the paper
A point charge ‘q’ is kept at each of the vertices of an equilateral triangle having each side ‘a’…
(A)(i)[1.0]
A point charge ‘q’ is kept at each of the vertices of an equilateral triangle having each side ‘a’. Total electrostatic potential energy of the system is:
- (a)$\left(\frac{1}{4\pi\varepsilon_0}\right) \frac{3q^2}{a^2}$
- (b)$\left(\frac{1}{4\pi\varepsilon_0}\right) \frac{3q}{a}$
- (c)$\left(\frac{1}{4\pi\varepsilon_0}\right) \frac{3q^2}{a}$
- (d)$\left(\frac{1}{4\pi\varepsilon_0}\right) \frac{3q}{a^2}$
(A)(ii)[1.0]
Curie temperature is the temperature above which:
- (a)a ferromagnetic substance behaves like a paramagnetic substance.
- (b)a paramagnetic substance behaves like a diamagnetic substance.
- (c)a ferromagnetic substance behaves like a diamagnetic substance.
- (d)a paramagnetic substance behaves like a ferromagnetic substance.
(A)(iii)[1.0]
In an astronomical telescope of refracting type:
- (a)Objective should have small focal length.
- (b)Objective should have large focal length.
- (c)Eyepiece should have large focal length.
- (d)Both objective and eyepiece should have large focal length.
(A)(iv)[1.0]
In photoelectric effect experiment, the slope of the graph of the stopping potential versus frequency gives the value of:
- (a)$\frac{h}{e}$
- (b)$h$
- (c)$\frac{e}{h}$
- (d)$\frac{hc}{e}$
(A)(v)[1.0]
In a nuclear reactor, cadmium rods are used as:
- (a)Control rods
- (b)Fuel rods
- (c)Coolant
- (d)Moderator
(B)(i)[1.0]
State Gauss’ theorem.
(B)(ii)[1.0]
A metallic wire having a resistance of $20\ \Omega$ is bent in order to form a complete circle. Calculate the resistance between any two diametrically opposite points on the circle.
(B)(iii)[1.0]
How can a moving coil galvanometer be converted into a voltmeter?
(B)(iv)[1.0]
Write Biot-Savart’s law in vector form.
(B)(v)[1.0]
What is the phase difference between any two points lying on the same wavefront?
(B)(vi)[1.0]
Name the physical principle on the basis of which optical fibres work.
(B)(vii)[1.0]
What is Pair production?
Answer
No answer yet.
From ISC 2020 Physics Paper 1, question 1.