Which of the following does NOT travel in a vacuum?

Q-1;  Which of the following does NOT travel in a vacuum?

1) radio waves
2) gamma rays
3) magnetic waves
4) sound waves
ANSWER: 4 -- SOUND WAVES

Q-2; What is the amplitude of a standing wave at its node?

ANSWER: 0

Q-3; An incident ray comes in parallel to the principle axis of a concave mirror. Is it reflected:

1) back along the incident ray
2) at 30 degrees to incident ray
3) through the focal point
4) through the center of curvature
ANSWER: 3 -- THROUGH THE FOCAL POINT

Q-4;For small oscillations, what happens to the period of a simple pendulum when the mass of the pendulum bob is doubled?

ANSWER: NOTHING or PERIOD IS UNAFFECTED

Q-5; Why must soldiers break cadence when crossing a bridge?

ANSWER: SO THEY DON'T EXCITE A VIBRATIONAL RESONANCE IN THE
BRIDGE.

Q-6; Who named the two kinds of electrical charges "positive" and "negative"?

ANSWER: BENJAMIN FRANKLIN

Q-7; What SI prefix is used to represent 10-18?

ANSWER: ATTO

Q-8;When a slingshot exerts a 10 Newton force on a rock, the rock accelerates at 50 meters per second squared. What force is required to accelerate the rock to 150 meters per second squared?

ANSWER: 30 NEWTONS

Q-9; How are work and power related?

ANSWER: POWER IS THE AMOUNT OF WORK PER UNIT TIME

Q-10;Heat transfer by mixing is more commonly known as what?

ANSWER: CONVECTION

Q-11;Sound waves are an example of what type of wave?

ANSWER: COMPRESSIONAL or LONGITUDINAL

Q-12;In physics, how is intensity defined?

ANSWER: POWER PER UNIT AREA

Q-13;What is the SI unit of inductance?

ANSWER: HENRY

Q-14; What is the SI unit of magnetic flux?

ANSWER: WEBER

Q-15; Who invented the electric battery?

ANSWER: (ALLESANDRO) VOLTA

Q-16; What is the resistance of an ideal voltmeter?

ANSWER: INFINITE RESISTANCE

Q-17;What is the resistance of an ideal ammeter?

ANSWER: ZERO