VITEEE Physics Test - 5 - JEE MCQ

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

The average power dissipated in a pure inductor of inductance L when an A.C. current is passing through it is

A wire of radius r has resistance R. If it is stretched to a radius of 3r/4, its resistance becomes

The length of given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be

If an electron revolves in the path of a circle of radius of 0.5x 10^-10  m at a frequency of 5 x 10¹⁵  cycles ∕ sec , the electric current in the circle is (charge of electron = 1.6 x 10^-19  C )

At what temperature, the resistance of a copper wire will become three times its value at 0^oC ? (Temperature coefficient of resistance for copper = 4 x 10^-3per ^oC)

If particles are moving with same velocity, then maximum de-Broglie's wavelength will be for

The core of a transformer is laminated so that

A solenoid of length 20 cm area of cross-section 4 cm² and having 4000 turns is placed inside another solenoid of 2000 turns having a cross-section area 8 cm² and length 10 cm. The mutual inductance of the system is

Two coils are placed close to eachother. The mutual inductance of the pair of coils depends upon

Which of the following waves have maximum wavelength?

Eight dipoles of charges of magnitude e are placed inside a cube. The total electric flux coming out of the cube will be

Two charges -10 C and + 10 C are placed 10cm apart. Potential at the centre of the line joining two charges 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

If an uncharged capacitor is charged by connecting it to a battery, then the amount of energy lost as heat is

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

In β ⁺ decay process, the following changes take place inside the nucleus

A current carrying loop is free to return in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at

Which of the following is more effective in inducing nuclear fission

What is the Q-value of the reaction
p + ⁷ Li → ⁴ He + ⁴ He
The atomic masses of ¹ H , ⁴ H e and ⁷ L i are 1.007825 u, 4.002603 u and 7.016004 u respectively

The refractive index of a certain glass is 1.5, for a light of wavelength 6000 Å . When light (c = 3 x 10⁸ m s^-1)passed through this glass, its wavelength is

The minimum potential difference between the base and emitter required to switch a silicon transistor 'ON' is approximately

The intrinsic semiconductor becomes an insulator at