Question with Answer B. Pharma
1. A rocket of mass 1000 kg exhaust gases at a rate of 4 kg/s with a velocity 3000 m/s. The thurst developed on the rocket is
(a) 12000 N
(b) 120 N
(c) 800 N
(d) 200 N
Ans. (a)
2. A small ball describes a horizontal circle on the smooth inner surface of a conical funnel. If the height of the plane of the circle above the vertex be 10 cm; what is the speed of the particle?
(a) 2 m/s
(b) 4 m/s
(c) 16 m/s
(d) 1 m/s
Ans. (d)
3. At what temperature is the r.m.s. velocity of a hydrogen molecule equal to that of an oxygen molecule at 470C ?
(a) 80 K
(b) -73 K
(b) 3 K
(d) 20 K
Ans. (d)
4.The period of oscillations of a mass 1.6 kg suspended from a spring is 2 seconds. If along with it another mass kg is also suspended, the period of oscillations increases by one second. The mass is
(a) 1 kg
(b) 2 kg
(c) 1.6 kg
(d) 2.6 kg
Ans. (b)
5. Two coherent sources must have the same
(a) Amplitude
(b) Phase difference only
(c) Frequency only
(d) Phase difference and frequency
Ans. (d)
6. When a source is going away from a stationary observer with a velocity equal to that of sound in air, the frequency heard by observer will be
(a) Same
(b) Double
(c) Half
(d) One- third
Ans. (c)
7.Ultrasonic waves are produced by
(a) Piezoelectric effect
(b) Pettiro’s effect
(c) Dopplers effect
(d) None of these
Ans. (a)
8. At a point on the axis of an electric dipole:
(a) The electric field E is zero
(b) The electric potential V is zero
(c) Neither E nor V is zero
(d) Both E and V are zero
Ans. (c)
9. The quantity in electricity analogous to temperature is
(a) inductance
(b) charge
(c) resistance
(d) potential
Ans. (d)
10. Four bulbs marked 40 W, 250 V are connected in series with 250 V mains, the total power consumed is
(a) 10 W
(b) 40 W
(c) 320 W
(d) 160 W
Ans. (a)
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