Rays Aiims Exam 2016
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- 1.A vernier callipers is used to measure the length of a cylinder. 10 divisions of the Vernier scale coincides with 9 divisions of the main scale. The best suited length (measured ) is
- A.
9.713 cm
- B.
9.97 cm
- C.
9.01 cm
- D.
9.01 mm
- 2.The number of significant digits that may be present in a value recorded using a millimeter graduated meter scale is
- A.
1
- B.
2
- C.
3
- D.
1,2,3 or 4
- 3.With increase in temperature, the viscosity of
- A.
Both gases and liquids increases
- B.
Both gases and liquids decreases
- C.
gases increases and of liquids decreases
- D.
gases decreases and of liquids increases
- 4.Terminal velocity of water drops depends upon the
- A.
Radius of drop
- B.
Charge of drop
- C.
Temperature of drop
- D.
Velocity of light
- 5.In a machine is lubricated with oil
- A.
The mechanical advantage of the machine increases
- B.
The mechanical efficiency of the machine increases
- C.
Both its mechanical advantage and efficiency increase
- D.
Its efficiency increase, but its mechanical advantage decreases.
- 6.A student’s life was saved in an automobile accident because an air bag expanded in front of his head. If the car had not been equipped with an air bag, the windshield would have stopped the motion of his head in a much shorter time. Compared to the windshield, the air bag
- A.
Exerts a much smaller impulse
- B.
causes a much smaller change in kinetic energy
- C.
exerts a much smaller force
- D.
does much more work
- 7.A box weighing 100 N is at rest on a horizontal floor. The coefficient of static friction between the box and the floor is 0.4. What is the smallest force F exerted eastward and upward at an angle of 30o with the horizontal that can start the box in motion?
- A.
27.5 N
- B.
37.5 N
- C.
14.2 N
- D.
45.4 N
- 8.A bowling ball is tied to a rope such that the rope lifts the ball straight up at a constant velocity. The magnitude of the tension in the rope is
- A.
Greater than the force of gravity on the ball
- B.
Equal to the net force acting on the ball
- C.
Less than the force of gravity on the ball
- D.
Equal to the force of gravity on the ball
- 9.The ratio of angular momentum of earth for its orbital motion and its daily rotation is
- A.
Much greater than 1
- B.
Smaller than 1
- C.
Equal to 1
- D.
Slightly greater than 1
- 10.A particle undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particle remain conserved?
- A.
Centre of the circle
- B.
On the circumference of the circle
- C.
Inside the circle
- D.
Outside the circle
- 11.The depth from the surface of the earth of radius R at which the acceleration due to gravity will be 75 % of the value on the surface of the earth is
- A.
R/4
- B.
R/2
- C.
3R/4
- D.
R/8
- 12.A space ship moves from earth to moon and back. the greatest energy required for the space ship is to overcome the difficulty in
- A.
Entering the earth’s gravitational field
- B.
Take off from earth’s field
- C.
Take off from lunar surface
- D.
Entering the moon’s lunar surface
- 13.The true weight of an object in a geostationary satellite whose weight at N pole is 10 N is
- A.
zero
- B.
10 N
- C.
2.3 N
- D.
0.23 N
- 14.If the radius of the earth decreases by 10 %, the mass remaining unchanged, the acceleration due to gravity will
- A.
Increase by 18 %
- B.
Decrease by 18 %
- C.
Increase by more than 18 %
- D.
Decrease by more than 18%
- 15.A mass m attached to a spring oscillates with a period of 3s. If the mass is increased by 1kg the period increases by 1s. The initial mass m in kg is
- A.
7/9
- B.
9/7
- C.
14/9
- D.
18/7
- 16.A vertical mass-spring system executes simple harmonic oscillations with a period of 2s. The quantity of this system which exhibits simple harmonic variation with a period of 1s is
- A.
velocity
- B.
Potential energy
- C.
Phase difference between acceleration and displacement
- D.
Difference between kinetic energy and potential energy
- 17.Two identical springs of constant K are connected in series and parallel. A mass M is suspended from them. The ratio of their frequencies of vertical oscillations will be
- A.
2:1
- B.
1:2
- C.
1:4
- D.
4:1
- 18.A potential difference is applied across the ends of a metallic wire. If the potential difference is doubled, the drift velocity
- A.
Will be doubled
- B.
Will be halved
- C.
Will be quadrupled
- D.
Will remain unchanged
- 19.In thermocouple, the temperature of the cold junction is 10oC. The temperature of inversion is 510oC. The neutral temperature of the thermocouple is
- A.
255 oC
- B.
260 oC
- C.
265 oC
- D.
250 oC
- 20.The electric current passing through a metallic wire produces heat because of
- A.
Collisions of conduction electrons with each other
- B.
Collisions of the atoms of the metal with each other
- C.
The energy released in the ionization of the atoms of the metal
- D.
Collisions of the conduction electrons with the atoms of the metallic wire
- 21.In an orbital motion, the angular momentum vector is
- A.
along the radius vector
- B.
parallel to the linear momentum
- C.
in the orbital plane
- D.
perpendicular to the orbital plane
- 22.Consider an n-p-n transistor amplifier in common emitter configuration. The current gain of the transistor is 100. If the collector currents changes by 1 mA, what will be the change in emitter current?
- A.
1.1 mA
- B.
1.01 mA
- C.
0.01 mA
- D.
10 mA
- 23.A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerate at 2ms-2. He reaches the ground with a speed of 3 ms-1. At what height, did he bail out
- A.
91 m
- B.
182 m
- C.
293 m
- D.
111 m
- 24.The mutual inductance of an inductance coil is 5 Henry. In the primary coil the current reduces from 5A to zero in 10-3s . What is the induced emf in the secondary coil?
- A.
2500V
- B.
25000V
- C.
2510V
- D.
zero
- 25.In each of the following questions a statement of Assertion is given followed by corresponding statement of Reason just below it. Of the statements mark the correct answer as A) If both Assertion and reason are true the reason is the correct explanation of the Assertion B) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion C) If Assertion is true but Reason is false D) If both Assertion and Reason are false E) The Assertion is false but the reason is trueAssertion : The number of electrons in a p-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.Reason : It is due to law of mass action
- A.
A
- B.
B
- C.
C
- D.
D
- E.
E
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