SAT Physics: Radiations Quiz Questions and Answers PDF Download - 49

The higher the temperature of the surface of the object relative to the surrounding temperature, the rate of infrared radiation will be

1. zero
2. equal
3. higher
4. lesser

A aircraft starts from rest and its propeller produces a forward force of 30000 N. The mass of the aircraft is 35000 kg. If there is no friction then the initial acceleration of the aircraft is

1. 1.16 ms^-2
2. 1.33 ms^-2
3. 0.85 ms^-2
4. 2.36 ms^-2

For meter rules, the zero mark is often at the rule's

1. end
2. middle
3. start
4. can be at middle or start

The ratio for the efficiency of a machine is

1. (useful energy output + energy input) × 100&percent;
2. (useful energy output - energy input) × 100&percent;
3. (useful energy input / energy output × 100&percent;
4. (useful energy output / energy input) × 100&percent;

A medical device using optical fibers to enable doctors to see organs inside a human body, such as intestine, is called

1. lens
2. microscope
3. endoscope
4. light pipe