List of practice Questions

The current gain of a transistor in common emitter configuration is 45. If the resistances in collector and base sides of the circuit are 4.5 kΩ and 900 Ω, the voltage gain of the amplifier is:
The height of a transmitting antenna is 320 m and the height of a receiving antenna is 20 m. The maximum distance between them for satisfactory communication in LOS mode is:
Which of the following gives proof of quantized electronic energy levels in hydrogen atom?
A galvanometer of resistance 99.9 \( \Omega \) gives a full scale deflection when 5 mA current is passed through it. The resistance to be connected to the galvanometer such that it can be converted into an ammeter of range 0-5 A is:
A coil of 100 turns and 0.10 m\(^2\) area, making two rotations per second is placed in a 0.01 T uniform magnetic field perpendicular to its axis of rotation. The maximum voltage generated in the coil is:
Resonance phenomenon is exhibited by a circuit only if:
The physical quantity which has the same value for green light, \(\gamma\)-radiation, and X-rays is:
Sixteen point charges each of charge \( q \) are placed on the circumference of a circle of radius \( r \) with equal angular spacing. If one of the charges is removed, then the net electric field at the centre of the circle is \( \varepsilon_0 \) (where \( \varepsilon_0 \) is the permittivity of free space). What is the net electric field at the centre?
The relation between the charge \( Q \) (in coulombs) passing through a resistor of resistance 200 \(\Omega\) and the time of flow of charge \( t \) (in seconds) is \( Q = 3t - 4t^2 \). The total heat produced in the resistor up to the time when instantaneous current becomes zero is:
A cell of emf 2 V is connected to an external resistor. If the current through the resistor is 200 mA and the terminal voltage of the cell is 87.5% of the emf of the cell, then the internal resistance of the cell is:
The gas that gives the highest fractional conversion of heat to work in an isobaric process is:
A solid sphere is rolling on a horizontal surface without slipping. The ratio of the translational and rotational kinetic energies of the sphere is
The time period of a simple pendulum on the surface of the earth is \( T \). The time period of the same pendulum at a height of 1280 km from the surface of the earth is
The theory currently accepted as proper framework for explaining microscopic phenomena is
A body thrown vertically upwards with certain velocity from the ground reaches a maximum height \( H \). The ratio of the times at which the body is at a height of \( \frac{H}{2} \) is:
Vision of the children born to a colour blind father and normal homozygous mother is
Seymouria is a transitional form between
Assertion (A): Influenza vaccine is an inactivated whole agent vaccine.
Reason (R): It contains killed microbes.
The secretions of this gland play major role in differentiation of T- lymphocytes.
Pick up the incorrect pair:
These enzymes function actively in acidic medium.
Assertion(A) :The reaction between \( CO_2 \) and \( H_2O \) in the RBC is much faster than in blood plasma. Reason(R) :Red blood cells contain a very high concentration of carbonic anhydrase
Statement I:Angina pectoris is a warning signal of deprivation of blood supply to the heart muscles.
Statement II:Coronary artery disease is also called atherosclerotic heart disease.
During glomerular filtration, net filtration pressure that causes filtration of blood in glomerular capillaries of Bowman's capsule is
The thick filaments in a sarcomere of a myofibril are held together by a thin fibrous membrane called