JEE Main 2014 (Online) 19th April Morning Slot

1

PYP

JEE Main 2014 (Online) 19th April Morning Slot

An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity B, the magnetic field B_s inside the superconductor will be such that :

A

B_s = $$-$$ B

B

B_s = 0

C

B_s = B

D

B_s < B  but  B_s $$ \ne $$ 0

2

PYP

JEE Main 2014 (Online) 19th April Morning Slot

The diameter of the objective lens of microscope makes an angle $$\beta $$ at the focus of the microscope. Further, the medium between the object and the lens is an oil of refractive index n. Then the resolving power of the microscope.

A

Increases with decreasing value of n

B

Increases with decreasing value of $$\beta $$

C

Increases with increasing value of n sin 2$$\beta $$

D

Increases with increasing value of $${1 \over {n\sin 2\beta }}$$

3

PYP

JEE Main 2014 (Online) 19th April Morning Slot

A piece of wood from a recently cut tree shows 20 decays per minute. A wooden piece of same size placed in a museum (obtained from a tree cut many years back) shows 2 decays per minute. If half life of C¹⁴ is 5730 years, then age of the wooden piece placed in the museum is approximately :

A

10439 years

B

13094 years

C

19039 years

D

39049 years

4

PYP

JEE Main 2014 (Online) 19th April Morning Slot

Match List - I (Experiment performed) with List - II (Phenomena discovered/associated) and select the correct option from the options given below the lists :

List - I		List - II
(a)	Davisson and Germer Experiment	(i)	Wave nature of electrons
(b)	Millikan’s oil drop experiment	(ii)	Charge of an electron
(c)	Rutherford experiment	(iii)	Quantisation of energy levels
(d)	Franck - Hertz experiment	(iv)	Existence of nucleus

A

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

B

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

C

(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)

D

(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

5

PYP

JEE Main 2014 (Online) 19th April Morning Slot

If microwaves, X rays, infracted, gamma rays, ultra-violet, radio waves and visible parts of the electromagnetic spectrum by M, X, I, G, U, R and V, the following is the arrangement in ascending order of wavelength :

A

R, M, I, V, U, X  and  G

B

M, R, V, X, U, G  and  I

C

G, X, U, V, I, M  and  R

D

I, M, R, U, V, X  and  G