Physics - Online Test
Q1. Capacitance is defined as
Answer : Option A
Explaination / Solution:
Capacitance of any conductor is defined as the ratio of the charge given to the conductor to the potential developed in conductor.C=Q/V
Q2. The moment of inertia of a body about any axis is
Answer : Option C
Explaination / Solution:
according to parallel axis theorem the moment of inertia of a body about any axis is equal to the sum of the moment of inertia of the body about a parallel axis passing through its Centre of mass and the product of its mass and the square of the distance between the two parallel axes.
Q3. The lift on an aircraft wing arises because of
Answer : Option C
Explaination / Solution:
This is the application of Bernoulli's Theorem.
If air speeds up the pressure is lowered.Thus,a wing generates lift because the air goes faster over the top creating a region of low pressure,and thus lift.
Q4. Mean free path is the
Answer : Option D
Explaination / Solution:
the mean free path is the average distance traveled by a moving particle (such as an atom, a molecule, a photon) between successive impacts (collisions), which modify its direction or energy or other particle properties.
Q5. Dispersion is
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. The disintegration energy is
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. A pure inductor of 20.0 mH is connected to a source of 230 V. Inductive reactance and rms current in the circuit (if the frequency of the source is 50 Hz). are
Answer : Option C
Explaination / Solution:
inductive reactance
rms current
Q8. The latent heat of fusion is.
Answer : Option C
Explaination / Solution:
The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid at constant pressure.
Q9. magnitude of the magnetic moment of an electron of mass me if e is the charge on the electron and angular momentum is l, is
Answer : Option A
Explaination / Solution:
The electron moving in a circular orbit of radius r with a speed v and time period T constitutes a current .since,thereforeThe orbital magnetic moment of the electron The angular momentum of the electron ,sincetherefore,
Q10. The significant figures of a number
Answer : Option A
Explaination / Solution:
The significant figures of a number are digits that carry meaning contributing to its measurement resolution. This includes all digits except:
- All leading zeros;
- Trailing zeros when they are merely placeholders to indicate the scale of the number (exact rules are explained at identifying significant figures); and
- Spurious digits introduced, for example, by calculations carried out to greater precision than that of the original data, or measurements reported to a greater precision than the equipment supports.
