physics

A girl standing some distance from the cliff claps her hands and hears the echo 0.8s later. calculate her distance from the cliff. [speed of sound in air = 320 ms‾¹]

A. 23m B. 128m C. 288m D. 298m Correct Answer: Option B Explanation V = 2nxE = 2×1×X/0.8 = 320…

6 years ago

When an air column is set into vibrations, the distance between two consecutive nodes of the resultant wave is?

A. one-quarter of the wavelength B. half of the wavelength C. the wavelength D. twice the wavelength Correct Answer: Option…

6 years ago

A swimming pool is 2.1m deep. If it contains water of refractive index 1.3, calculate the apparent depth of pool?

A. 3.4m B. 2.7m C. 1.6m D. 0.8m Correct Answer: Option C Explanation n = real depth/apparent depth 1.3 =…

6 years ago

An object is placed 15cm from a diverging lens of focal length 1cm. The image of the object formed by the lens in?

A. real and 6.67cm from the lens B. virtual and 6.67cm from the lens C. real and 60.00cm from the…

6 years ago

What type of wave is emitted by a loud speaker?

A. Transverse B. Longitudinal C. Gamma D. Radio Correct Answer: Option B B. Longitudinal

6 years ago

The diagram given illustrates wave-form. Determine the speed of the wave

A. 5.4 ms‾¹ B. 8.4 ms‾¹ C. 9.6 ms‾¹ D. 10.0 ms‾¹ Correct Answer: Option D D. 10.0 ms‾¹

6 years ago

The pressure applied to an enclosed fluid to one end id transmitted equally throughout the fluid and to the container walls. This statement is

A. Archimede's principle B. Bernoulli's principle C. Pascal's principle Heisenberg's D. Heisenberg's uncertainty principle Correct Answer: Option C C. Pascal's…

6 years ago

Which of the following units is the S.I. unit of heat capacity?

A. Jkg‾¹ B. Jkg‾¹K‾¹ C. JK‾¹ D. Jg‾¹K‾¹ Correct Answer: Option A A. Jkg‾¹

6 years ago

Which of the following concepts is a method of heat transfer that does not require a material medium?

A. conduction B. radiation C. diffusion D. convection Correct Answer: Option B B. radiation

6 years ago

In an experiment in which a molten substance is allowed to cool, the cooling curve above was obtained. The temperature 60ºC is known as the?

A. vaporization point B. cooling temperature C. boiling point D. melting point Correct Answer: Option D D. melting point

6 years ago
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