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1. According to the kinetic theory of gases, the pressure exerted by a gas on the walls is measured as
(a) rate of change of momentum imparted to the walls per second per unit area.(b) momentum imparted to the walls per unit area(c) change of momentum imparted to the walls per unit area.(d) change in momentum per unit volume
2. The fundamental frequency of a closed end organ pipe is n. Its length is doubled and radius is halved. Its frequency will become nearly
(a) n/2 (b) n/3 (c) n (d) 2n
3. A rain drop of radius 0.3 mm has a terminal velocity in air = 1m/s. the viscosity of air is 8×10-5 poise. The viscous force on it isa) 45.2 × 10-4 dyneb) 101.73 × 10-5 dynec) 16.95 × 10-4 dyned) 16.95 × 10-5 dyne
4. A 2V battery is connected across AB as shown in the figure. The value of the current supplied by the battery when in one case battery’s positive terminal is connected to A and in other case when positive terminal of battery is connected to B will respectively be:
(a) 0.4 A and 0.2 A(b) 0.2 A and 0.4 A(c) 0.1 A and 0.2 A(d) 0.2 A and 0.1 A
5. Steam is passed into 22 gm of water at 20°C. The mass of water that will be present when the water acquires a temperature of 90°C (Latent heat of steam is 540 cal/g) is
(a) 24.83 gm(b) 24 gm(c) 36.6 gm(d) 30 gm
6. Electromotive force is the force which is able to maintain a constant
(a) potential difference(b) power(c) resistance(d) current
7. A charge particle moving in magnetic field B, has the components of velocity along B as well as perpendicular to B. The path of the charge particle will be
(a) helical path with the axis perpendicular to the direction of magnetic field B(b) straight along the direction of magnetic field B(c) helical path with the axis along magnetic field B(d) circular path
8. In an AC generator, a coil with N turns, all the same area A and total resistance R, rotates with frequency cd in a magnetic field B. The maximum value of emf generated in the coil isa) NABRωb) NABc) NABRd) NABω
9. A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is (a) 16J (b) 8J(c) 32 J (d) 24 J
10. The effective capacitance between the points P and Q of the arrangement shown in the figure is
11. A glass rod 20 cm long is clamped al the middle. It is set into the longitudinal vibration. If the emitted sound frequency is 4000 Hz, the velocity of sound in glass will be
(a) 2800 m/s(b) 3200 m/s(c) 1600 m/s (d) 2000 m/s
12. In bringing an electron towards another electron, the electrostatic potential energy of system
(a) increases(b) decreases(c) becomes zero(d) remains unchanged
13. A conducting loop of radius 10/√π cm is placed perpendicular to a uniform magnetic field of 0.5T. The magnetic field is decreased to zero in 0.5 s at a steady rate. The induced emf in the circular loop at 0.25 s is:
(a) emf=1mV(b) emf=10mV(c) emf=100mV(d) emf=5mV
14. In an electromagnetic wave, at an instant and at a particular position, the electric field is along the negative z-axis and magnetic field is along the positive x-axis. Then the direction of propagation of electromagnetic wave is:
(a) at 45° angle from positive y-axis(b) negative y-axis(c) positive z-axis (d) positive y-axis
15. Identify the solar cell characteristics from the following options:
16. A 100 m long wire having cross-sectional area and Young’s modulus is is subjected to a load of 250 N, then the elongation in the wire will be:a) 6.25 × 10-3 mb) 4 × 10-4 mc) 6.25 × 10-6 md) 4 × 10-3 m
17. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along the
(a) radius of orbit(b) tangent to the orbit (c) line parallel to plane of rotation(d) line perpendicular to plane of rotation
18. Kirchhoff’s I and II laws are based on conservation of
(a) energy and charge respectively(b) charge and energy respectively(c) mass and charge respectively(d) None of these
19. Use of eddy currents is done in the following except
(a) moving coil galvanometer(b) electric brakes(c) induction motor(d) dynamo
20. A satellite of mass m is put into a circular orbit of height h from the surface of the earth (mass = Me, radius = Re) The orbital speed of satellite is