JEE Main Test 38

Result

JEE Main Test 38

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Weekly Quiz Competition

Question 1
4 / -1

A man in an empty swimming pool uses a magnifier (n = 1.25) to enlarge the print on a plastic instruction sheet. If the pool is filled with water with refractive index of 1.33, what happens to the magnification of the print?

A
It decreases and is less than one

B
It increases and is greater than one.

C
It decreases, but is still greater than one.

D
It stays the same.

Solution

Since the water has a greater index of refraction than the lens,

Therefore, the magnifier will now acts like a diverging lens.

The image will be smaller than the object.
Question 2
4 / -1

In Bohr’s theory of hydrogen atom, if r, v and E represent the radius of orbit, speed of electron and the total energy of the electron respectively, then which of the following quantities will be proportional to the quantum number n?

A
r /v

B
vr

C
rv/E

D
vE/r

Solution

Since,

Orbital radius, r ∝ n²

Orbital Velocity, v ∝ 1/n

total energy E ∝ 1/n²

Therefore, rv ∝ n
Question 3
4 / -1

Select the correct statement from the following. (1984, 2M)

A
the current in a diode is always proportional to the applied voltage

B
a triode cannot be used as a rectifier

C
a diode can be used as a rectifier

D
the linear portion of the I-V characteristic of a triode is used for amplication without distortion

Solution

p-n junction diodes are mostly used as a rectifier for the AC Currents.