List of top Physics Questions asked in GAT-B

Which one of the following is the working principle behind optical fibers?
What type of modulation is used in television transmission?
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The major source of energy for the basic functioning of the cell is derived from oxidative metabolism.
Reason R: Mitochondria oxidize substrates to $CO_{2}$, transferring the high energy electron from molecular oxygen to glucose.
In uniform circular motion, which one of the following properties changes with time?
Point charges, +q each is placed at the corners of a triangle, square and regular pentagon. If the sides are a each, the electric field at the center will be:
Which one of the following attributes of an electromagnetic wave remains constant when it enters from air to water?
Moving electron (velocity v) produces a magnetic field B such that:
Which one of the following is NOT a property of a LASER?
Which one of the following force does not act on a cyclist when he/ she bends on a horizontal turn?
Which one of the following describes the relation between the acceleration of a body in space and the distance (r) of the body from the center of the earth?
Energy of a photon of wavelength 410 nm is equal to the band gap of a semi-conductor. What is the minimum energy required to create an electron-hole pair? ($h = 1 \times 10^{-15}$ eV.s, $c = 3 \times 10^{8}$ m/s)
Which one of the following is NOT due to total internal reflection?
What is the focal length (f) of a combination of lenses (convex and concave) as given below? $f_{1}=30$, $f_{2}=20$
What will happen when the pressure is doubled in an isothermal process for a closed system containing a fixed amount of an ideal gas?
The magnetic susceptibility is negative for:
Which one of the following properties is primarily responsible for spreading of oil uniformly on water?
What is the net capacitance of the circuit given below? (C1 = 4$\mu$F, C2 = 8$\mu$F in series, C3 = 6$\mu$F in parallel)
Cooling water enters the cooling coil of a fermenter at $7$°C and leaves at $27$°C because it picks up the heat generated due to microbial growth. The culture temperature is $37$°C. The average temperature difference which is used to calculate the rate of heat transfer is:
Given a constant Power number, the power consumption of an agitator having geometric similarity but twice the diameter of a smaller agitator will consume ________ power at the same RPM as the smaller agitator.
Fleming's "left hand rule" is associated with the effect of
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by:
A solid cylinder and a hollow cylinder of the equal radius and mass start rolling down (without slipping) on a fixed inclined plane from rest at the same time at the same height from the ground. Which of the following statements is correct?
A radioactive material has a half life of 10 years. What fraction of radioactive nuclei will remain undecayed with respect to the initial sample after 20 years?
A battery of emf 1.50 V and internal resistance 0.50 ohm supplies a current of 100 mA. The potential difference across the terminal of the battery will be:
The position of a particle moving along the X-axis as a function of time t (in seconds) is given by $X = t^{3}-9t + 2$. The magnitude of the acceleration of the particle at $t=3$ seconds is: