Q1. A particle of charge q and mass m moves in a circular orbit of radius r
with angular speed w. The ration of the magnitude of its magnetic to that of
its angular momentum depends on
(a) ω and q (b) ω q and m
(c) q and m (d) ω and m
Q2. Two vibrating strings of the same material but lengths L and 2L have
radii 2r and r respectively. They are stretched under the same tension. Both
the strings vibrate in their fundamental modes, the one of length L with
frequency v1 and the other with frequency v2. The ratio v1 / v2 is given by:
(a) 2 (b) 4
(c) 8 (d) 1
Q3. Image an atom made up of a proton and a hypothetical particle of double
the mass of the electron but having the same charge as the electron. Apply
the Bohr atom model and consider all possible transactions of this
hypothetical particle to the first excited level. The longest wavelength
photon that will be emitted has wavelength λ (given in terms of the Rydberg
constant R for the hydrogen atom) equal to
(a) 9/(5R) (b) 36/(5R)
(c) 18/(5R) (d) 4/R
Q4. Among H2 O, H2 S, H2 Se and H2 Te, the one with the highest boiling
point is
(a) H2 O because of hydrogen bonding.
(b) H2 Te because of higher molecular weight.
(c) H2 S because of hydrogen bonding.
(d) H2 Se because of lower molecular weight.
The questions below (5 to 9) consist of an ‘Assertion’ in column 1 and the
‘Reason’ in column 2. Use the following key to choose the appropriate
answer.
(a) If both assertion and reason are CORRECT and reason is the
CORRECT explanation of the assertion.
(b) If both assertion and reason are CORRECT, but reason is NOT the
CORRECT explanation of the assertion.
(c) If assertion is CORRECT, but reason in INCORRECT.
(d) If assertion is INCORRECT but reason is CORRECT.
Assertion (column 1) Reason (column 2)0
Q5. The first ionization energy of be 2p orbital is lower in energy
Greater than that of B. than 2s.
Q6. 1-butene on reaction with HBr in It involves the formation of a
The presence of a peroxide produces primary radical.
Bromobutane
Q7. The heat absorbed during the The volume occupied by the
Isothermal expansion of an ideal molecules of an ideal gas
Gas vacuum is zero against is zero
Q8. The pressure of a fixed amount an Frequency of collisions and
ideal gas is proportional to its their impact both increase in
temperature. Proportion to the square root
of temperature.
Q9. Phenol is more reactive than benzene In the case of phenol, the
Towards electrophilic substitution intermediate carbocation is
Reaction. More resonance stabilized.
Q10. Let f (θ) = sin θ (sin θ + sin 3 θ). Then f (θ)
(a) ≥ 0 only when θ ≥ 0 (b) ≤ 0 for all real θ
(c) ≥ for all real θ (d) ≤ 0 only when θ ≤ 0
Q11. If x+y=k is normal to y² =12x, then k is
(a) 3 (b) 9
(c) -9 (d) -3