591. At the top of the trajectory of a projectile, the directions of its velocity and acceleration are:
A. Perpendicular to each other
B. Parallel to each other
C. Inclined to each other at an angle of 45 degrees
D. Antiparallel to each other
592. When a body is moving on a surface, the force of friction is called:
A. Static friction
B. Dynamic friction
C. Limiting friction
D. Rolling friction
593. Combining two displacement vectors of magnitudes 6m and 8m will produce a resultant displacement of 10m:
A. Parallel
B. Anti parallel
C. At an angle of 60 degrees
D. Perpendicular to each other
594. If the values of instantaneous and average velocities are equal, the body is said to be moving with:
A. Uniform acceleration
B. Uniform speed
C. Variable velocity
D. Uniform velocity
595. Particles travel at a speed of 10 m/s at any given instant and 20 m/s after 5 seconds. In m/s, the speed 3s before is:
A. 8
B. 4
C. 6
D. 2
596. In case when there is no total displacement and average velocity, then the motion is described by:
A. Variable velocity
B. Instantaneous velocity
C. Initial velocity
D. None of the above
597. Krypton (atomic number 36) has how many electrons in its next to outermost shell?
(A) 18
(B) 32
(C) 50
D) 60
598. The frequency is adjusted by?
(A) Filtering
(B) Rectification
C) Tuning
(D) Demodulation
599. Integrated circuits are critical for high-speed computers. The fast response is due to?
(A) Close packing of components.
(B) Miniaturization
C) Miniaturization and close packing of components.
(D) None of the above
600. A uniform wire of length L and diameter d has a resistance R. Another wire of the same material has a length 2L and diameter 2d. Its resistance will be?
(A) R
B) R/2
(C) 2R
(D) 4R
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