Of the following answers, which is the frequency closest to middle-C on a piano?

Q-1: Of the following answers, which is the frequency closest to middle-C on a piano?

1) 20
2) 256
3) 2520
4) 25200
ANSWER: 2 -- 256

Q-2: The non-relativistic mass of an object

1) must be the same as its weight
2) depends on where you measure it
3) does not change with increasing velocity
4) is greatest at the poles
ANSWER: 3 -- DOES NOT CHANGE WITH INCREASING VELOCITY

Q-3:A ball is thrown horizontally from the top of a cliff. Assuming no air resistance, the acceleration of the ball while it is in flight is:

1) in the vertical direction only
2) in the horizontal direction only
3) in the vertical and horizontal directions
4) zero.
ANSWER: 1 -- IN THE VERTICAL DIRECTION ONLY

Q-4:While traveling in a straight line, a car uniformly changes its speed from 50 kilometers per hour to 110 kilometers per hour in 5 seconds. The acceleration of the car during this time is:

1) 5 kilometers per hour per second
2) 12 kilometers per hour per second
3) 50 kilometers per hour per second
4) 60 kilometers per hour per second
ANSWER: 2 -- 12 KILOMETERS PER HOUR PER SECOND

Q-5: If there is to be a change in velocity, there MUST be a change in

1) speed only
2) direction only
3) either speed or direction
4) both speed and direction
ANSWER: 3 -- EITHER SPEED OR DIRECTION

Q-6: Susan pushes against a 100 kilogram rock with a force of 5 Newtons, but the rock doesn't move. The force the rock exerts on Susan is

1) 0 Newtons
2) 5 Newtons
3) 20 Newtons
4) 100 Newtons
ANSWER: 2 -- 5 NEWTONS