Magnetism and Matter — Physics STD 12 Science — Question

A man can see the objects upto a distance of one metre from his eyes. For correcting his eye sight so that he can see an object at infinity, he requires a lens whose power is(a) + 0.5 D(b)  + 1.0 D  (c) + 2.0 D(d)  – 1.0 D 

The magnitude of saturation photoelectric current depends upon(a) Frequency (b) Intensity(c) Work function(d) Stopping potential

Two non ideal batteries are connected in series. Consider the following statements
(A) The equivalent emf is larger than either of the two emfs.
(B) The equivalent internal resistance is smaller than either of the two internal resistances.

Consider the following statements regarding series grouping of capacitors and select the correct statements.

1. Charge on each capacitor remains same and equals to the main charge supplied by the battery.
2. Potential difference and energy distributes in the reverse ratio of capacitance.
3. Effective capacitance is even less than the least of teh individual capacitances.

Assertion :  If two long wires, hanging freely are connected to a battery in series, they come closer to each other.
Reason     : Force of attraction acts between the two wires carrying current.(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 large virtual image of object is formed by :

The phenomenon of beats can take place:

When a hydrogen bomb explodes, which of the following is used?

What is the difference between soft and hard X-rays (a) Velocity(b) Intensity(c) Frequency(d) Polarization

Assertion  :   Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron.
Reason      : A charged particle produces a magnetic field.