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IIT Main Physics Practice Test

Q1.In forced oscillation of a particle the amplitude is maximum for a frequency ω1 of the force ωhile the energy is maximum for a frequency ω2 of the force; then
(a) ω1< ω2ωhen damping is small and ω1> ω2ωhen damping is large
(b) ω1> ω2
(c) ω1 = ω2
(d) ω1< ω2

Q2. In gamma ray emission from a nucleus
(a) only the proton number changes
(b) both the neutron number and the proton number change
(c) there is no change in the proton number and the neutron number
(d) only the neutron number changes

Q3. Time taken by a 836 W heater to heat one litre of water from 10°C to 40°C is
(a) 150 s
(b) 100 s
(c) 50 s
(d) 200 s

Q4. In the middle of the depletion layer of a reverse- biased p-n junction, the
(a) electric field is zero
(b) potential is maximum
(c) electric field is maximum
(d) potential is zero

Q5. Infrared radiation is detected by
(a) spectrometer
(b) pyrometer
(c) nanometer
(d) photometer

Q6. Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced on it is
(a) 20
(b) 80
(c) 40
(d) 120.

Q7. Let [Î0]denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then:  
Î0 = [M–1 L–3 T2 A]
Î0 = [M1 L3 T5 A2]
Î0 = [M1 L2 T1 A2]
Î0 = [M1 L2 T1 A]

Q8. Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t1 is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio t1/ t2 will be
(a) 1
(b) ½
(c) ¼
(d) 2

Q9. One kg of a diatomic gas is at a pressure of 8 × 104N/m2. The density of the gas is 4kg/m3. What is the energy of the gas due to its thermal motion?
(a) 5 × 104 J
(b) 6 × 104 J
(c) 7 × 104 J
(d) 3 × 104 J

Q10. One mole of ideal monatomic gas (γ = 5/3)is mixed with one mole of diatomic gas (γ = 7/5). What is g for the mixture? γ Denotes the ratio of specific heat at constant pressure, to that at constant volume
(a) 35/23
(b) 23/15
(c) 3/2
(d) 4/3

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