581. A 50 kg woman stands on a scale in an elevator. What does the scale read if the elevator is moving upwards with an acceleration of 2 m/s2?
(A) 490 N
(B) 550 N
C) 590 N
(D) 599 N
582. A transformer has 50 turns in primary and 250 turns in secondary coil. If the primary voltage is 14 V. What is output voltage?
(A) 26.00 V
(B) 7.00 V
(C) 2.80 V
D) 70.00 V
583. In monitoring body temperature the __ waves are used.
A) Infrared waves
(B) Ultraviolet waves
(C) Radio waves
(D) Micro waves
584. An object of mass m moves in a uniform circular motion on a horizontal frictionless table. The radius of the circle is r and centripetal force F. If the radius and speed are v are doubled, what is the centripetal force now?
(A) F
B) 2F
(C) F/2
(D) 4F
585. You are a passenger on a hot air balloon that is rising with constant velocity and you are carrying a buzzer that emits a sound of frequency f. If you accidentally drop the buzzer from the balloon. What can you conclude about the sound you hear as if falls to the ground?
A) The frequency decreases and intensity decreases
(B) The frequency remains the same and the intensity decreases
(C) The frequency decreases and intensity increases
(D) None of the above
586. Area of a sphere of radius 35cm is?
A) 1.22 m2
(B) 0.043 m3
(C) 0.135 m3
(D) 0.0122 m2
587. The Horizontal range of a projectile, at a certain place, depends upon:
A. The mass of the projectile
B. The velocity of projection
C. The angle of projection
D. The angle as well as velocity of projection
588. The velocity and acceleration of a body moving with uniform speed in a circle are:
A. Parallel
B. Opposite
C. Mutually perpendicular
D. None of the above
589. The time it would take for an iron ball and a wooden ball of the same radius to reach ground from a height of “H” in a vacuum would be:
A. Unequal
B. Exactly equal
C. Roughly equal
D. Zero
590. Which of the following statements for an object in equilibrium is not true?
A. The object must be at rest
B. The article can be very still
C. The object continues to move at the same speed.
D. The object has no acceleration.
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