Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

The temperature range in the definition of calorie is

  1. $14.5^{o}C $<span>&nbsp;</span>to $15.5^{o}C $

  2. $15.5^{o}C $ to $16.5^{o}C $

  3. $1^{o}C $ to $2^{o}C $

  4. $13.5^{o}C $ to $14.5^{o}C $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the International Committee of Pure Physics, calorie is the standard unit to measure heat. The quantity of heat required to raise 1 gram of water from $14.5^o C \ to \ 15.5^o C$ is defined as a calorie.

Multiple choice physics measurement and effects of heat sources of heat introduction to heat measuring temperature

Out of the metal balls of same diameter one is solid and other is hollow. Both are heated to the same temperature at $300^{0}C$ and then allowed to cool in the same surroundings then rate of loss of heat will be:

  1. More for hollow sphere

  2. More for solid sphere

  3. Same for both

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rate of loss of heat depends on the surface area and the emissivity. For a hollow sphere and a solid sphere of the same diameter, the surface area is identical. However, the hollow sphere has less mass, meaning it has a lower heat capacity and will cool faster.

Multiple choice physics world of sounds sound produced by humans propagation of sound production and propagation of sound

Which of the following voices is likely to have minimum frequency?

  1. Baby girl

  2. Baby boy

  3. A man

  4. A woman
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A man’s sound is of the lower pitch as compared to the other options. And we know that pitch is directly proportional to the frequency of sound. So, the frequency of man’s voice will be the minimum among all the options.

Multiple choice physics sound sound produced by humans propagation of sound production and propagation of sound

We, humans, produce sound by using

  1. oesophagus

  2. larynx

  3. thyroid Gland

  4. mouth
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Larynx is known as the voice box. It is located at the upper end of the windpipe. The vocal cords stretch the larynx in such a way that a passage is created between them. When air passes through this passage the vocal cords vibrate and produce sound.