Physics - Online Test
Q1. Comparing X-rays and Gamma rays
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. If AC generator coil has area A, rotates in a magnetic field of B with an angular speed ω , the voltage generated is
Answer : Option C
Explaination / Solution:
e=NBAωSinωt
Q3. The momentum of photon having energy E is
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. Bandwidth of an electronic communication system
Answer : Option C
Explaination / Solution:
A range within a band of wavelengths, frequencies, or energies; especially : a range of radio frequencies which is occupied by a modulated carrier wave, which is assigned to a service, or over which a device can operate.
Q5. Which of the following algebraic operations on vectors not permissible?
Answer : Option A
Explaination / Solution:
Although vectors and scalars represent different types of physical quantities, it is sometimes necessary for them to interact. While adding a scalar to a vector is impossible because of their different dimensions in space, it is possible to multiply a vector by a scalar.
Q6. in an elastic collision
Answer : Option D
Explaination / Solution:
kinetic energy is transferred to other forms of energy—such as thermal energy, potential energy, and sound—during the collision process. After collision if recovery of kinetic energy is 100% then it is called elastic collision.So that in an elastic collision the total kinetic energy of the system is the same after the collision as before.
Q7. Gauss's law states that
Answer : Option D
Explaination / Solution:
Gauss Theorem--- According to Gauss theorem the electric flux through a closed surface is given by times
Q8. For a bar of length l, breadth b, and depth d as shown in figure the deflection is given by
Answer : Option D
Explaination / Solution:
No Explaination.
Q9. Kelvin-Planck statement of Second Law of Thermodynamics states that
Answer : Option B
Explaination / Solution:
it is impossible to devise a cyclically operating device, the sole effect of which is to absorb energy in the form of heat from a single thermal reservoir and to deliver an equivalent amount of work. This implies that it is impossible to build a heat engine that has 100% thermal efficiency.
Q10. Balmer series emission wavelengths are described by
Answer : Option B
Explaination / Solution:
No Explaination.
