Physics - Online Test
Q1. The magnetic induction in air at point 1 cm away from a long wire that carries a current of 1 A, will be
Answer : Option D
Explaination / Solution:
B=μ0I2πr=4π×10−7×12π×1×10−2=2×10−5T
Q2. Electric charge is expressed in SI units as
Answer : Option B
Explaination / Solution:
The SI derived unit of electric charge is the coulomb (C). The symbol Q often denotes charge.
Q3. In the circuit shown below, the galvanometer G will show zero deflection
Answer : Option C
Explaination / Solution:
The ratio of the resistances in the arms is not equal. The wheatstone’s network is not balanced. The galvanometer will continue to show deflection in all cases.
Q4.
The maximum velocity and maximum acceleration of a body moving in a simple harmonic oscillation are 2 m/s and 4 . The angular velocity is
Answer : Option C
Explaination / Solution:
No Explaination.
Q5. Which of the following phenomenon cannot be explained by diffraction?
Answer : Option A
Explaination / Solution:
No Explaination.
Q6. If you made a map of magnetic field lines at Melbourne in Australia, would the or of the ground?
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. To obtain a p-type germanium semiconductor, it must be doped with
Answer : Option C
Explaination / Solution:
p-type germanium semiconductor is formed when it is doped with a trivalent impurity atom. So it should be doped with indium.
Q8.
The area under the velocity-time curve between times and is equal to the.
Answer : Option C
Explaination / Solution:
The area under the velocity-time curve between times t1 and t2 is equal to the displacement of the object during that interval of time.
Q9. When sound travels from air to water the quantity that remains unchanged is
Answer : Option B
Explaination / Solution:
No Explaination.
Q10. The magnetic field in a plane electromagnetic wave is given by By =. Wavelength and frequency of the wave are
Answer : Option D
Explaination / Solution:
No Explaination.
