Electric Charges and Fields — Physics STD 12 Science — Question

Two point charges Q  and – 3Q are placed at some distance apart. If the electric field at the location of Q is E then at the locality of -3Q, it is

(a) - E

(b) E/3

(c) -3E

(d) -E/3

How does the potential difference change with the effect of the dielectric when the battery is kept disconnected from the capacitor?

10 C charge is passing through any point in electric circuit in 0.5 second. The magnitude of electric current in the circuit in amperes is:

A moving coil galvanometer can be converted into voltmeter by:

Mass number is:

In DC circuit inductive reactance of inductance is __________ .

Complete the reaction: 
₈₆​Rn²²⁰→₈₄​Po²¹⁶+ __________:

The ionisation potential of hydrogen atom is 13.6 volt. The energy required to remove an electron in the n = 2 state of the hydrogen atom is

(a) 27.2 eV

(b) 13.6 eV

(c) 6.8 eV

(d) 3.4 eV

Wavefront of a wave has direction with wave motion

(a) Parallel

(b) Perpendicular

(c) Opposite

(d) At an angle of 𝜃

Consider two waves passing through the same string. Principle of superposition for displacement says that the net displacement of a particle on the string is sum of the displacements produced by the two waves individually. Suppose we state similar principles for the net velocity of the particle and the net kinetic energy of the particle. Such a principle will be valid for:

1. Both the velocity and the kinetic energy.
2. The velocity but not for the kinetic energy.
3. The kinetic energy but not for the velocity.
4. Neither the velocity nor the kinetic energy.