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1.

`AB` and `CD` are long staright conductors, distance `d` apart, carrying a current `I`. The magnetic field on `BC` due to the currents in `AB` and `CD` A. `P propt`B. `P prop(1)/(t)`C. `P prop(1)/(sqrt(1))`D. P is independent of t.

Answer» Correct Answer - B
Discussion
2.

Two conducting spheres of radii r and 3r initially have charges 3q & q respectively. Their separation is much larger their radii. If they are joined by a conductor of high resistance, the force between them will :A. increase continuouslyB. decrease continuouslyC. first increase and then decreaseD. first decrease and then increase

Answer» Correct Answer - C
Discussion
3.

When unit mass of water boils to become steam at `100^(@)C`, it absorbs Q amount of heat. The densities of water and steam at `100^(@)C` are `rho_(1)` and `rho_(2)` respectively and the atmospheric pressure is `P_(0)`. The increase in internal energy of the water isA. QB. `Q+p_(0)((1)/(rho_(1))-(1)/(rho_(2)))`C. `Q+p_(0)((1)/(rho_(2))-(1)/(rho_(1)))`D. `Q-p_(0)((1)/(rho_(1))-(1)/(rho_(2)))`

Answer» Correct Answer - B
Discussion
4.

One cubic meter of an ideal gas ia at a pressure at `10^(5)N//m^(2)` and temperature 300K. The gas is allowed to expand at constant pressure to twice its volume by supplying heat. If the change in internal energy in this process is `10^(4)J`, then the heat supplied isA. `10^(15)` atmB. `10^(-10)` atmC. `10^(-5)` atmD. 1 atm

Answer» Correct Answer - A
Discussion
5.

In the circuit shown the cells are ideal and of equal emfs, the capacitance of the capacitor is `C` and the resistance of the resistor is `R`. `X` is first joined to `Y`and then to `Z`. After a long time, the total heat produced in the resistor will be A. equal to the energy finally stored in the capacitorB. half the energy finally stored in the capacitorC. twice the energy finally stored in the capacitorD. Four times the energy finally stored in the capacitor

Answer» Correct Answer - D
Discussion
6.

STATEMENT-1: Real images cannot be formed by reflection of light in a convex mirror. STATEMENT-2: Parallel rays incident on a convex mirror must diverge after reflection.A. Statement-1 is True , Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True , Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.C. Statement-1 is True , Statement-2 is False.D. Statement-1 is False , Statement-2 is True.

Answer» Correct Answer - C
Discussion
7.

A hydrogen atom in an excited state emits a photon which has the longest wavelength of the Paschen series. Further emissions from the atom cannot inculde theA. longest wavelength of the Lyman seriesB. second-longest wavelength of the Lyman seriesC. longest wavelength of the Balmer seriesD. Second longest wavelength of the Balmer series

Answer» Correct Answer - D
Discussion
8.

A tuning fork sounded together with a tuning fork of frequency 256 emits two beats. On loading the tuning fork of frequency 256, the number of beats heard are 1 per second. The frequency of tuning fork isA. Statement-1 is True , Statement-2 is True, Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True , Statement-2 is True, Statement-2 is not a correct explanation for Statement-1.C. Statement-1 is True , Statement-2 is False.D. Statement-1 is False , Statement-2 is True.

Answer» Correct Answer - D
Discussion
9.

A converging lens of focal length `20cm`and diameter`5cm`is cut along the line`AB`.The part of the lens shown shaded in the diagram is now used to form an image of a point `P`placed `30cm`away from it on the line`XY`.Which id perpendicualr to the plane of the lens.The image of`P`will be formed. A. on XYB. 1 cm below XYC. 0.5 cm below XYD. 0.5 cm XY

Answer» Correct Answer - C
Discussion