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question_answer1) A projectile is projected with the velocity u at an angle with horizontal. If the range equals to the maximum height reached, then the time of flight equals (a) (b) (c) (d)
question_answer2) A racing bike is designed such that its engine provides power to its front wheel. The direction of friction in the two wheels will be equal to (a) front wheel forward. Rear wheel backward. (b) front wheel backward. Rear wheel forward. (c) on both the wheels, in forward direction. (d) on both the wheels, in backward direction.
question_answer3) Two surfaces A and B are in contact. Both the surfaces are polished continuously. The value of co-efficient of friction between the two surfaces (a) will decrease (b) will increase (c) will first increase, then decrease (d) will first decrease, then increase
question_answer4) A light straight beam is pivoted at centre by a thin pin. And two pans are attached at its two ends by pins. The pin C is supported by rigid support. The beam is released making an angle with horizontal. One can bring it in horizontal position (a) spontaneously without any action (b) by putting equal weights on both the pans (c) by putting more weight on pan A than on pan B (d) by putting more weight on pan B than on pan A
question_answer5) Two trains are running on the same railway track and collide due to lineman's mistake. The two trains are of comparable masses and you can assume that after collision they fit tightly together and start moving with same velocity. Neglect any collision between ground, track poles, etc. In which case, the loss will be most severe? (a) Both the trains moving towards east with velocities80 km/h and 60 km/h. (b) Both the trains moving towards west with velocities50 km/h and 30 km/h. (c) One train moving towards east while another towards west, the velocity of each being 20 km/h. (d) Both the trains moving towards west with velocities 70 km/h and 40 km/h.
question_answer6) Two discs A and B of moment of inertia and have angular speeds and in opposite senses. They are brought in contact coaxially and due to friction they attain a common angular speed. The thermal energy developed in the process is (a) (b) (c) (d)
question_answer7) The equation of motion of a particle is given by It can be visualized as the superposition/resultant of several SHM components in the same direction. The number of components, the amplitude and the time periods of the components are, respectively, (a)Two components: (b) Three components: (c) Four components: (d) No components
question_answer8) Doppler's effect is valid for light waves also. If a star emitting yellow light accelerates away from the earth, the colour of star as observed by an observer on earth (a) remains yellow (b) gradually turns red (c) gradually turns blue (d) first turns red then blue
question_answer9) There are two thin lenses, each of focal length 50 cm. One is of 10 cm diameter, while another is of 20 cm diameter. What will be the difference in images formed by the two lenses? (a) Intensity and resolution will be higher for the larger lens. (b) Intensity and resolution will be lower for the larger lens. (c) Intensity will be higher and resolution will be lower for the larger lens. (d) Intensity will be lower and resolution will be higher for the larger lens.
question_answer10) There is a copper rod of square cross-section, the dimension of each side being 2a, but having a square hole throughout the rod, dimension of each side of hole being a. A brass rod exactly fitting inside the hole is inserted in the hole. Now, both sides of the rod are welded together. The temperature is elevated by . Neglecting any lateral expansion or stresses developed, the composite length of the system at temperature will be (a) (b) (c) (d)
question_answer11) If the P - V diagrams of two thermodynamics devices working in a cyclic process are as shown in the figure, then (a) A is a heat engine, B is a heat pump/refrigerator (b) B is a heat engine, A is a heat pump/refrigerator (c) both A and B are heat engines (d) both A and B are heat pumps/refrigerator
question_answer12) An electric field of exists in the space. The electric potential at A = (3 m, 4 m, 5 m) is (Choose the electric potential at R = (10 m, 10 m, 10 m,) to be zero i.e. R as a reference point.) (a) 52.01 V (b) 104.02 V (c) 208.04 V (d) 312.06 V
question_answer13) Find the potential energy of an electric dipole of dipole moment , placed perpendicular to a uniform electric field . [Choose potential energy to be zero, when the dipole axis is parallel to the electric field.] (a) Zero (b) PE (c) - PE (d) 2PE
question_answer14) A uniform magnetic field exists in a cubical box along +ve z-direction. A particles projected from the origin 0 in xz plane making some acute anglewith positive z-axis. As a result, the particle goes in a helix touching all the four faces of cubical box along the magnetic field and lands at another face at P. The anglebetween the velocity of projection and +ve z-axis is (a) (b) (c) (d)
question_answer15) A right angled bent pipe is suspended by means of a string as shown in the figure. When water inside the tube is at rest, then tension in the string is . If the same liquid flows with a velocity v, then tension in the string is . Then (a) (b) (c) (d)
question_answer16) In the given circuit, if bulb B is glowing with maximum possible brightness, then the value of R is (a) (b) (c) (d)
question_answer17) How does the Magnetic susceptibilityof a paramagnetic material changes with absolute temperature T? (a) (b) (c) (d)
question_answer18) Three massless and very large conductors A, B and C, having resistances in the ratio of 2 : 3 : 5, are connected as shown in the figure. Conductors A and B are separated by a distance of 5cm. If B is in equilibrium, then conductors C and A are separated by a distance of (neglecting the capacitance of conductors) (a) 2 cm (b) 5 cm (c) 7 cm (d) 9 cm
question_answer19) A beam of 450 nm light is incident on a metal having work function 2 eV and placed in a magnetic field of. If the most energetic electrons emitted are bent into circular path, the maximum value of the radius of curvature of their path is (a) 0.4 m (b) 0.04 m (c) 0.02 m (d) 0.2 m
question_answer20) The binding energy per nucleon for is about 7.5MeV, whereas it is about 8.5 MeV for nuclei of half that mass. If a nucleus were to split into two equal size nuclei, the energy released during this process would be (a) 235 MeV (b) 328 MeV (c) 238 MeV (d) 300 MeV
question_answer21) The temperature of a mono-atomic gas in a uniform container of length 'L' varies linearly from to as shown in the figure. If the molecular weight of the gas is ,then the time taken by a wave pulse in travelling from end A to end B is (a) (b) (c) (d) None of these
question_answer22) A particle starts from rest and moves with an acceleration of a = {2 + t - 2|} m/s2. The velocity of the particle at r = 4 sec is (a) 2 m/s (b) 4 m/s (c) zero (d) 12 m/s
question_answer23) When the two jaws of a verniercallipers having least count 0.01 cm touch each other, the 8th division fernier scale coincides with a main scale division. But when diameter of a cylinder is measured by placing it between the two jaws, the zero of vernier scale is slightly to the left of main scale reading of 2.3 cm and 4th vernierdivision coincids with a main scale division. Then,(Assume that zero of vernier scale lies right to zero of main scale). (a) the zero error of verniercallipers is - 0.08 cm (b) the radius of the cylinder is 1.12 cm (c) the radius of the cylinder is 1.08 cm (d) the length of the cylinder is 5.08 cm
question_answer24) If R is the radius of the earth and g is the acceleration due to gravity on earth's surface, then time period of a pendulum of infinite length on the surface of the earth will be (a) (b) (c) (d)
question_answer25) A barometer gives wrong readings because some air is present above the mercury column. When atmospheric pressure is 760 mm of Hg, the barometer shows 750 mm and when atmospheric pressure is 740 mm of Hg, the barometer shows 735 mm. What is the length of barometer tube? (a) 770 mm (b) 800 mm (c) 765 mm (d) 795 mm
question_answer26) For an ideal gas (a) speed of sound is always greater than rms speed of its molecules. (b) speed of sound is times less than the rms speed of its molecules. (c) speed of sound is times less than the rms speed of its molecules. (d) rms speed of molecules is less than the average speed of its molecules.
question_answer27) When a body has the same temperature as that of its surroundings (a) it does not radiate heat (b) it radiates same quantity of heat as received from the surroundings. (c) it radiates less quantity of heat as received from the surroundings. (d) it radiates more quantity of heat as received from the surrounding.
question_answer28) In Young's double slit experiment, the source S oscillates simple harmonically along a line parallel to AB and perpendicular to central line SQO. (a) The fringe width changes simple harmonically. (b) The fringe width changes but not simple harmonically. (c) The fringe width remains constant. (d) Position of nth fringes does not change.
question_answer29) In the given circuit, the switch is closed at time t = 0. Each resistance is of . The current i in the circuit after a very long time will be (a) zero (b) 4 A (c) 6 A (d) 2 A
question_answer30) A transistor is connected in common-emitter (CE) configuration. The collector supply is 8 V and the voltage across a resistor of 800 in the collector is 0.5 V. if the current gain factor () is 0.96, then the base current is (a) (b) (c) (d)
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