Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be
A
1 : 4
B
1 : 2
C
1 : 1
D
1 : 5
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted
(i) A is feebly repelled
(ii) B is feebly attracted
(iii) C is strongly attracted
(iv) D remains unaffected
Which one of the following is true ?
A
B is of a paramagnetic material
B
C is of a diamagnetic material
C
D is of a ferromagnetic material
D
A is of a non-magnetic material
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
In the ac circuit an alternating voltage e = $$200\sqrt 2 $$sin100t volts is connected to a capacitor of capacity 1 $$\mu $$F. The r.m.s. value of the current in the circuit is