Practice Test FOR PHYSICS

EASY:

A man on a railroad car observes a pendulum which is suspended from the ceiling hang at angle of 10 degrees to the right with respect to the vertical axis. Which of the following answers could explain this phenomenon.

• The railroad car is at rest.

• The railroad car is accelerating to the left.

• The railroad car is moving with constant velocity to the right.

• The railroad car is accelerating to the right.

EASY:

The Earth and Moon exert forces on each other but the Moon is roughly 1/4 the size and 1/8 the mass of the Earth. How does the magnitude of the force the Earth exerts on the Moon compare to the magnitude of the force the Moon exert on the Earth?

• It is four times greater.

• It is eighty times greater.

• It is 6,400 time greater.

• It is the same.

EASY:

A gas in a closed container is heated. Which of the following changes would you expect?

• the molecules of the gas gain kinetic energy.

• the number of the molecules of gas increases.

• the molecules of gas will collide less frequently

• the temperature of the gas will decrease.

EASY:

At what distance in front of a concave mirror must an object be placed so that the image and object are at the same size.

• focal length

• half a focal length

• twice the focal length

• less than half the focal length

EASY:

An ordinary light bulb is marked 60 W, 120 V. Solve for its resistance. Express your answer in Ohms.

EASY:

Two uncharged metal spheres, L & M are in contact. A negatively charged rod is brought close to L, but not touching it. The two spheres are slightly separated and the rod is then withdrawn. As a result

• both spheres are neutral

• both spheres are positive

• both spheres are negative

• L is negative and M is positive.

EASY:

A basic postulate of Einstein's theory of relativity is

• moving clock runs more slowly than when are at rest.

• moving rods are shorter than when they are at rest.

• light has both wave and particle properties.

• the laws of physics must be the same for observers moving with uniform velocity relative to each other.

MODERATE:

The children at a park sit on opposite ends of a see-saw. The first child sits closer to the center of the see-saw. What is true about the children's weights if the see-saw is at rest with both ends off the ground?

• The children have the same weight because the see-saw is balanced.

• The first child is lighter in weight than the second child.

• The second child is light in weight than the first child.

• More information is needed to draw any conclusion about the children's weight.

MODERATE:

A block of mass MA= 25 kg is on the floor and block B of mass MB = 10 kg is placed on top of block A. Both blocks move with constant acceleration (a = 2 m/s^2) to the right, and the coefficient of static friction between the two blocks is 0.8. Solve for the magnitude of static frictional force acting between the blocks. Assume that there is no friction between block A and the floor. Express your answer in Newtons.

MODERATE:

What is the energy required in Joules, to move 2 coulombs of charge across a potential difference of 9V.