Moving Charges and Magnetism — Physics STD 12 Science — Question

The truth table shown in figure is for

(a) XOR

(b) AND

(c) XNOR

(d) OR

Which of the following atoms has the lowest ionization potential

(a)

(b)

(c)

(d)

The ground state energy of hydrogen atom is – 13.6 eV. What is the potential energy of the electron in this state

(a) 0 eV

(b) – 27.2 eV

(c) 1 eV

(d) 2 eV

An element X has mass number 10, and number of neutrons = 7. Then what will be the number of proton?

The angular velocity of the engine (and hence of the wheel) of a scooter is proportional to the petrol input per second. The scooter is moving on a frictionless road with uniform velocity. If the petrol input is increased by 10%, the linear velocity of the scooter is increased by:

1. 50%
2. 10%
3. 20%
4. 0%

Figure shows the position of a particle moving on the X-axis as a function of time.

1. The particle has come to rest 6 times.
2. The maximum speed is at t = 6s.
3. The velocity remains positive for t = 0 to t = 6s.
4. The average velocity for the total period shown is negative.

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV

(a) 28

(b) 7

(c) 4

(d) 1

A narrow electron beam passes undeviated through an electric field E = 3  and an overlapping magnetic field B = 2 . If electric field and magnetic field are mutually perpendicular. The speed of the electrons is

(a) 60 m/s

(b) 10.3

(c) 1.5

(d) 0.67

Voltage in the secondary coil of a transformer does not depend upon.

(a) Voltage in the primary coil

(b) Ratio of number of turns in the two coils

(c) Frequency of the source

(d) Both (a) and (b)

Two equal and opposite charges of 5 coulomb are kept mutually at a distance of 5.0 cm. The electric dipole moment of the system is :