Physics - Online Test
Q1. Which one of the following is the natural nanomaterial.
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. If the amplitude of the
magnetic field is 3 × 10−6 T, then amplitude of the electric field
for a electromagnetic waves is
Answer : Option D
Explaination / Solution:
Q3. An object is placed in front of a convex mirror
of focal length of f and the maximum
and minimum distance of an object from the mirror such that the image formed is
real and magnified.
Answer : Option D
Explaination / Solution:
Since the nature of image produced by a convex mirror is always virtual, erect and diminished.
Q4. In a Young’s double-slit experiment, the slit separation is doubled. To maintain the same fringe spacing on the screen, the screen-to-slit distance D must be changed to,
Answer : Option A
Explaination / Solution:
Q5. What is the ratio of the
charges |q1/q2| for the following electric field line pattern?
Answer : Option D
Explaination / Solution:
Q6. A particle of mass 3 × 10–6 g has the
same wavelength as an electron moving with a velocity 6×106 m s−1
. The velocity of the particle is
Answer : Option D
Explaination / Solution:
Q7. A toaster operating at 240
V has a resistance of 120 Ω. The power is
Answer : Option C
Explaination / Solution:
Q8. Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is
Answer : Option C
Explaination / Solution:
The
ionization potential is
Q9. The force experienced by a
particle having mass m and charge q accelerated through a potential difference
V when it is kept under perpendicular magnetic field 
is
is
Answer : Option C
Explaination / Solution:
Q10. A forward biased diode is treated as
Answer : Option D
Explaination / Solution:
No Explaination.
