Physics - Online Test
Q1. Two points A and B are
maintained at a potential of 7 V and -4 V respectively. The work done in
moving 50 electrons from A to B is
Answer : Option A
Explaination / Solution:
Q2. The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is
Answer : Option B
Explaination / Solution:
Q3. What is the current out of
the battery?
Answer : Option A
Explaination / Solution:
Q4. The mass of a 73Li nucleus
is 0.042 u less than the sum of the masses of all its nucleons. The binding
energy per nucleon of 73Li nucleus is nearly
Answer : Option B
Explaination / Solution:
Δm
= 0.042 u
Energy
of 1u=931 MeV
B.E
= 0.042 × 931
=
39.102 MeV
B.E
/ A = 39.102 / 7 = 5.6 MeV
Q5. 
The BH curve for a ferromagnetic material
is shown in the figure. The material is placed inside a long solenoid which
contains 1000 turns/ cm. The current that should be passed in the solenonid to
demagnetize the ferromagnet completely is
Answer : Option B
Explaination / Solution:
Q6. If the input to the NOT gate is A = 1011, its output is
Answer : Option A
Explaination / Solution:
For
NOT Gate output Y = Ᾱ
Here
A = 1011 . ∴ Y =0100
Q7. In a series resonant RLC
circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is
250 rad/s. If the value of C is 4 µF, then the voltage across L is
Answer : Option C
Explaination / Solution:
Q8. Which of the following is an electromagnetic wave?
Answer : Option C
Explaination / Solution:
No Explaination.
Q9. If voltage applied on a
capacitor is increased from V to 2V, choose the correct conclusion.
Answer : Option C
Explaination / Solution:
Q10. A light of wavelength 500 nm is incident on a sensitive plate of photoelectric work function
1.235 eV. The kinetic energy of the photo electrons emitted is be (Take h = 6.6
× 10–34 Js)
Answer : Option C
Explaination / Solution:
