GEN PHYSICS REVIEW

X What will happen to the distance between two consecutive crests, when frequency increases and speed remain the same?

It increases.

• It increases.

• It decreases.

• Stays unchanged.

• It increases first and then decreases.

The acceleration of gravity on the Moon is one-sixth what it is on Earth. An object of mass 72 kg is taken to the Moon. What is its mass there?

• 12 N

• 72 N

• 72 kg

• 12 kg

Professor X is doing an experiment, based on the data controlled temperature turned to 56 °F. What will be the temperature in "C?

• 13.33

• 14.00

• 14:50

• 47.00

What is the intensity of the sound waves produced by a trumpet at a distance of 3.2 m when the power output of the trumpet is 0.20W? Assume the soundwaves are spherical.

• 1.6 x 10^3 W/m^2

• 1.6 x 10^-3 W/m^2

• 1.5 x 10^3 W/m^2

• 1.5 x 10^-3 W/m^2

Which of the following statements is true about longitudinal waves?

• They always have the same frequencies.

• They always have the same velocities

• The particles vibrate in a perpendicular direction as the wave motion.

• The particles vibrate in the same direction as the wave motion.

Two wave pulses with equal positive amplitudes travel on a cord approaching each other. What is the result of the oscillations when the pulses reach the same point?

• It is constructive interference with twice the amplitude.

• It is constructive interference with slightly greater amplitude.

• It is destructive interference with zero amplitude.

• It is constructive interference with the negative amplitude

When an object experiences uniform circular motion, what is the direction of the acceleration?

• same direction as the velocity vector.

• opposite direction of the velocity vector.

• directed toward the center of the circular path.

• directed away from the center of the circular path

The distance traveled by a wave in one period is called?"

• Frequency

• Speed of wave

• Period

• Wavelength

How many times greater than the lifting force must the force applied to a hydraulic lift be if the ratio of the area where the pressure is applied to the lifted area is 1/77

• 1/49

• 1/7

• 7

• 40

A 5.0 grams of wood is burnt after an hour it all turns to ashes, and weigh 4.5 g. What can you infer?

• It is a reversible process, and 0.5g of wood change to energy.

• It is an irreversible process, and follows the law of conservation of mass.

• No process that takes place, it remains the same.

• It is an irreversible process; 5.0 g wood is turned into ash.