VITEEE Physics Test - 6 - JEE MCQ

An air capacitor of capacity C = 10μ F is connected to a constant voltage battery of 12 volt. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is

If a cell of constant electromotive force produces the same amount of heat during the same time in two independent resistances R₁ and R₂, when connected separately one after the other, across the cell, then the internal resistance of the cell is

Consider telecommunication through optical fibres. Which of the following statements is not correct

Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1:2 and if no resistance value is fractional, the largest of the three resistances in ohms is

Three unequal resistors in parallel are equivalent to resistance 1 Ω . If two of them are in the ratio 1 : 2 and if no resistance value is fractional, the largest of the three resistances in ohms is

A steady current is passing through a conductor of non-uniform cross-section. The net quantity of charge crossing any cross-section per second is

The temperature coefficient of a resistance wire is 0.00125 per degree. The resistance at 300 K is 1 ohm. At what temperature its resistance will be 2 ohm, at

An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is

A choke coil has

Lenz's law is a consequence of the law of conservation of

If 2.2 kW power is transmitted through a 10 Ω line at 22000 V, the power loss in the form of heat will be

Which of the following electromagnetic waves have the smallest wavelength?

n small drops of same size are charged to V volt each. They coalesce to form a bigger drop. The potential of the bigger drop is

Two equal charges, q each are placed at a distance of 2a, and a third charge -2q is placed at the mid point. The potential energy of the system is

An infinite no. of capacitors with capacitances 1μF, 1/21μF, 1/41μF, 1/81μF, ...etc. are connected in parallel combination. Their equivalent capcitance will be

Two charges 8C and 6C are placed with a distance of separation d between them and exert a force of magnitude F on each other. If a charge - 4C is added to each of these and they brought nearer by a distance d/3, the magnitude of force between them will be

A charge q is placed at the corner of a cube of side l. The electric flux passing through the cube is

A charged particle is moving with velocity ν̅ in a magnetic field of induction B̅. The force on the particle will be maximum when

A chain reaction is fission of uranium is possible because

Two nuclei have their mass numbers in the ratio of 1:3 . The ratio of their nuclear densities would be

A radio active sample has a half life of 5 days. To decay from 8 micro curies to 1 micro-curie, the number of days taken will be

A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter is equal to 3/4 the angle of prism. The angle of deviation is

The electric circuit used to get smooth d.c. output from a rectifier circuit is called

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength: