MCQ

SINGLE CHOICE

1. A conducting rod is rotated in uniform magnetic force field (B)
with constant velocity (V). Thep.d. is developed between ends of rod when
a) V||l b) V||B c) l||B d) None

2. Inbinary system 111 represents—
a) 1 b) 3 c) 7 d) 100

3. Which of the following help us for recognition of precious stone
a) UV rays b) Infrared c) X- rays d) None

4. If two conducting spheres are connected after charging separately then—
a) both sphere energy will remain conserved
b) both charge remains conserved
c) both energy & charge remain conserved
d) None

MORE THAN ONE CHOICE

5. According to Bohr's theory of h ydrogen atom
a) (linear momentum is proportionel to 1/n
b) (the radius is proportionel to n)
c) (the K.E. is proportional to 1/n2
d) the angular momentum is proportional to n

6. A point object is placed at 30 cm from a convex glass lens (mu g = 3/2{ (refractive index) } of focal length 20 cm. The final image of
object will be formed at infinity if
a) another concave lens of focal length 60 cm is placed in contact with the previous lens
b) another conves lens of focal length 60 cm is placed at distance of 30 cm from the first lens
c) the whole system is immersed in a liquid of refractive index 4/3
d) the whole system is immersed ina liquid of refractive index 9/8

7. If a charged particle at rest experiences no electromagnetic force then
a) Electric field must be zero)
b) Magnetic field must be zero]
c) Electric field may or may not be zero
d) Magnetic field may or may not be zero