AIIMS Physics Objective questions Part 17

Q-1. A body is vibrating in simple harmonic motion with an amplitude of 0.06 m and frequency of 15 Hz. The maximum velocity and acceleration of the body is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-2. Kinetic energy of an electron accelerated in a potential difference of 100 V is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-3. If the equation of motion of standing waves is Equation then the velocity of standing waves

(a) 400 unit

(b) 250 unit

(c) 200 unit

(d) 150 unit

Q-4. On producing the waves of frequency 1000Hz in a kundt’s tube, the total distance between 6 successive nodes is 85 cm. Speed of sound in the gas filled in the tube is

(a) 300 m/s

(b) 350 m/s

(c) 340 m/s

(d) 330 m/s

Q-5. A particle executes simple harmonic motion of amplitude A. At what distance from the mean position its kinetic energy is equal to its potential energy is equal to its potential energy?

(a) 0.81 A

(b) 0.71 A

(c) 0.61 A

(d) 0.51 A

Q-6. For driving current of 2A for 6 minute in a circle 1000 J of work is to be done. the e.m.f. of the source in the circuit is

(a) 1.38 V

(b) 1.68 V

(c) 2.03 V

(d) 3.10 V

Q-7. A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of the air is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-8. An iron rod of length 2m and cross-sectional area of Equation stretched by 0.5mm,, when a mass of 250kg is hung from its lower end. young’s modulus of iron rod is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-9. Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force exerted by one wire on other per metre of length of the wire is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-.10 A wire has resistance of Equation and resistance Equation the temperature coefficient of resistance of the wire is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-11. If the current through 30 resistor is 0.8 A, then potential drop through 40 resistor is

(a) 1.2 V

(b) 2.6 V

(c) 4.8 V

(d) 9.6 V

Q-12. The direction of the null points is on the equatorial line of bar magnet, when the north pole of the magnet is pointing to

(a) west

(b) east

(c) south

(d) north

Q-13. Two batteries of e.m.f 4V and 8V having the internal resistance of Equation and Equation respectively are connected in circuit with a resistance of Equation as shown in the figure. The current and potential difference between the points P and Q are

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-14. A 30 gm bullet initially travelling at Equation penetrates 12 cm into wooden block. The average resistance exerted by the wooden block is

(a) 1800 N

(b) 2000 N

(c) 2200 N

(d) 2850 N

Q-15. A bar magnet of magnetic moment Equation is suspended in a magnetic field of intensity Equation the couple required to deflect it through Equation is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-16. Two magnets each of magnetic moment M are placed so as to form a cross at right angle to each other. The magnetic moment of the system will be

(a) M

(b) 0.5 M

(c) Equation

(d )2 M

Q-17. Sodium has body centered packing. Distance between two nearest atoms is 3.7 Equation The lattice parameter is

(a ) Equation

(b) Equation

(c) Equation

(d) Equation

Q-18. Which of the following are not the transverse waves?

(a) sound waves in the gas

(b) visible light waves

(c) Equation

(d) Equation

Q-19. The displacement X of a particle moving along a straight line at time t is given by

Equation

The acceleration of the particle is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-20. A bomb is dropped from an aeroplane moving horizontally at constant speed. if air resistance is taken into consideration, then the bomb

(a) falls on earth exactly below the aeroplane

(b) falls on the earth exactly behind the aeroplane

(c) falls on the earth ahead of the aeroplane

(d) flies with the aeroplane

Q-21. In a p-type semi-conductor germanium is doped with

(a) Aluminium

(b) Boron

(c) gallium

(d) all of these

Q-22. In a triode value, the current in the plate circuit is controlled by

(a) Ammeter

(b) Grid

(c) Cathode

(d) Anode

Q-23. When a bus suddenly takes a turn, the passengers are thrown outwards because of

(a) speed of motion

(b) Inertia of motion

(c) acceleration of motion

(d) none of these

Q-24. The logic behind NOR gate is that which gives

(a) high output when both input are high

(b) low output when both input are low

(c) high output when both inputs are low

(d) none of these

Q-25. Which of the following statement is not correct?

(a) Infra-red photons have more energy than photons of visible light

(b) Infra-red rays are invisible but can cast shadows like visible light

(c) Photographic plates are sensitive to ultraviolet rays

(d) Photographic plates are sensitive to infra-red rays

Q-26. In which sequence the radioactive radiations are emitted in the following nuclear reaction

Equation

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-27. In red light and violet light rays are of focal lengths Equation . Then which one of the following is true?

(a) Equation Equation

(b) Equation

(c) Equation Equation

(d) Equation

Q-28. The large scale destruction, that would be caused due to the use of nuclear weapons is known as

(a) neutron reproduction factor

(b) nuclear holocaust

(c) thermo nuclear reaction

(d) none of these

Q-29. if in Ramsden’s eye piece, the field lens have focal length Equation respectively and separated by a distance d then

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-30. Hygen’s wave theory of light could not explain

(a) Photoelectric effect

(b) polarization

(c) diffraction

(d) interference

Q-31. The work done in pulling up a block of wood weighing 2 KN for a length of 10 m on a smooth plane inclined at an angle of Equation with the horizontal is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-32. The internal resistance of cell of e.m.f. 2V is Equation it is connected to a resistance of Equation the voltage across the cell is

(a) 2.71 V

(b) 1.95 V

(c) 1.68 V

(d) 0.52 V

Q-33. The earth of mass Equation revolves around the sun with an angular velocity of Equation in a circular orbit radius Equation The force exerted by the sun, on the earth is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-34. A ball of mass 150 gm moving with acceleration Equation is bit by a force, which acts on it for 0.1 sec. The impulsive force is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-35. If the heat of 110 J is added to a gaseous system, whose internal energy is 40 J , then the amount of external work done is

(a) 80 J

(b) 70 J

(c) 115 J

(d) 140 J

Q-36. The substances in which the magnetic moment of a single atom is not zero, is called as

(a) Ferrimagnetism

(b) Paramagnetism

(c) Ferromagnetism

(d) Diamagnetism

Q-37. A luminous efficiency of a lamp is 4 lumen/ watt and its luminous intensity is 30 candelas. The power of lamp is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-38. Two vectors Equation are such that Equation If Equation is the angle between positive direction of Equation then the correct statement is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-39. A rough vertical board has an acceleration along the horizontal so that a block of mass M pressing against it does not fall. The coefficient of friction between block and the board is

(a) Equation

(b) Equation

(c) Equation

(d) Equation

Q-40. An aeroplane is moving with a horizontal velocity a at a height h. the velocity of packet dropped from it on the earth’s surface will be

(a) Equation

(b) 2gh

(c) Equation

(d) Equation