Wave Optics — Physics STD 12 Science — Question

Which one of the following planet has the longest day

(a) Venus

(b) Mars

(c) Mercury

(d) Earth

There are seven orbitals in a subshell then the value of l for it will be:

A certain piece of silver of given mass is to be made like a wire. Which of the following combination of length (L) and the area of cross-sectional (A) will lead to the smallest resistance

(a) L and A

(b) 2L and A/2

(c) L/2 and 2 A

(d) Any of the above, because volume of silver remains same

Two resistors R and 2R are connected in series in an electric circuit. The thermal energy developed in R and 2R are in the ratio:

The combined capacity of the parallel combination of two capacitors is four times their combined capacity when connected in series. This means that

(a) Their capacities are equal	(b) Their capacities are 1 μF and 2 μF
(c) Their capacities are 0.5 μF  and 1 μF	(d) Their capacities are infinite

5 cm long solenoid having 10 ohm resistance and 5 mH inductance is joined to a 10 volt battery. At steady state the current through the solenoid in ampere will be

(a) 5

(b) 1

(c) 2

(d) Zero

Let F_pp, F_pn and F_nn denote the magnitudes of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is 1fm:

1. F_pp > F_pn = F_nn
   
2. F_pp = F_pn = F_nn
   
3. F_pp > F_pn > F_nn
   
4. F_pp < F_pn = F_nn
   

Assertion  :   The 200 W bulbs glows with more brightness then 100 W bulbs.

Reason    : A 100 W bulb has more resistance than a 200 W bulb.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

A moving coil galvanometer has a resistance of 50 Ω and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A

(a) 50/99 Ω  in series	(b) 50/99 Ω in parallel
(c) 0.01 Ω in series	(d) 0.01 Ω in parallel

Maxwell’s equations describe the fundamental laws of

(a) Electricity only

(b) Magnetism only

(c) Mechanics only

(d) Both (a) and (b)