TN 12TH PHYSICS - Online Test
Q1. The blue print for making ultra durable synthetic material is mimicked from
Answer : Option C
Explaination / Solution:
No Explaination.
Q2. Which of the following
electromagnetic radiation is used for viewing objects through fog
Answer : Option D
Explaination / Solution:
No Explaination.
Q3. Which one of the following reaction represents calcinations?
Answer : Option C
Explaination / Solution:
No Explaination.
Q4. Which among the following is not a borane?
Answer : Option B
Explaination / Solution:
nido borane : BnH4+n
aracno borane : BnH6+n
Q5. Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively
Answer : Option B
Explaination / Solution:
No Explaination.
Q6. Which one of the following
ions has the same number of unpaired electrons as present in V3+?
Answer : Option C
Explaination / Solution:
No Explaination.
Q7. Oxidation state of Iron and
the charge on the ligand NO in [ Fe ( H2O)5 NO] SO4 are
Answer : Option D
Explaination / Solution:
Q8. Solid CO2 is an
example of
Answer : Option C
Explaination / Solution:
lattice points are occupied
by CO2 molecules
Q9. For a first order reaction
A → product with initial concentration x mol L−1 , has a half life period
of 2.5 hours . For the same reaction with initial concentration (x/2) mol L−1 the half life is
Answer : Option D
Explaination / Solution:
For a first order reaction
t1/2 = 0.693/k
t1/2 does not depend on the initial concentration and
it remains constant (whatever may be the initial concentration)
t1/2 = 2.5 hrs
Q10. For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is,
Answer : Option A
Explaination / Solution:
n= 2;
i=90◦
n = sin i / sin r
sin
r = sin i / n
= sin 90◦/2 = ½
r
= sin-1(1/2) = 30◦
