Questions

Which of the following circuits represents a forward biased diode?

Choose the correct answer from the options given below:

A closed organ and an open organ tube are filled by two different gases having same bulk modulus but different densities ρ₁ and ρ₂ respectively. The frequency of 9^th harmonic of closed tube is identical with 4^th harmonic of open tube. If the length of the closed tube is 10 cm and the density ratio of the gases is ρ₁: ρ₂ = 1:16, then the length of the open tube is:

Given below are two statements:

Statements-I: The equivalent emf of two non-ideal batteries connected in parallel is smaller than either of the two emfs.
Statement-II: The equivalent internal resistance of two non-ideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries.
In the light of the above statements, choose the correct answer from the options given below

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surfaces, then photo-electric effect is possible for the case of

Two spherical bodies of same materials having radii 0.2 m and 0.8 m are placed in same atmosphere. The temperature of the smaller body is 800 K and temperature of the bigger body is 400 K. If the energy radiated from the smaller body is E, the energy radiated from the bigger body is (assume, effect of the surrounding temperature to be negligible).

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