1
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60o is W. Now the torque required to keep the magnet in this new position is
A
$${W \over {\sqrt 3 }}$$
B
$$\sqrt 3 W$$
C
$${{\sqrt 3 W} \over 2}$$
D
$${{2W} \over {\sqrt 3 }}$$
2
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for combination ?
A
R = 20 $$\Omega $$, L = 1.5 H, C = 35 $$\mu $$F
B
R = 25 $$\Omega $$, L = 2.5 H, C = 45 $$\mu $$F
C
R = 15 $$\Omega $$, L = 3.5 H, C = 30 $$\mu $$F
D
R = 25 $$\Omega $$, L = 1.5 H, C = 45 $$\mu $$F
3
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aparture is illuminated normally by a parallel beam of wavelength 5 $$ \times $$ 10$$-$$5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is
A
0.10 cm
B
0.25 cm
C
0.20 cm
D
0.15 cm
4
NEET 2016 Phase 2
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical glass ($$\mu $$g = 3/2) equiconvex lenses of focal length $$f$$ each are kept in contact. The space between the two lenses is filled with water $$\left( {{\mu _w} = 4/3} \right)$$. The focal length of the combination is
A
$$f/3$$
B
$$f$$
C
$$4f/3$$
D
$$3f/4$$