TN 12TH PHYSICS - Online Test
Q1. Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is
Answer : Option B
Explaination / Solution:
k = A e –(Ea/RT)
ln k = ln A – (Ea/R)
(1/T)
this equation is in the
form of a straight line equatoion
y = c + m x
a plot of lnk vs 1/T is
a straight line with negative slope
Q2. 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.
Q3. 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:
Q4. What is the ratio of the
charges |q1/q2| for the following electric field line pattern?
Answer : Option D
Explaination / Solution:
Q5. 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:
Q6. A toaster operating at 240
V has a resistance of 120 Ω. The power is
Answer : Option C
Explaination / Solution:
Q7. 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
Q8. 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:
Q9. A forward biased diode is treated as
Answer : Option D
Explaination / Solution:
No Explaination.
Q10. The flux linked with a coil
at any instant t is given by ΦB = 10t 2 − 50t + 250. The induced emf at t = 3s is
Answer : Option B
Explaination / Solution:
