physics

A 40W instrument has a resistance 90 ohms. On what voltage should it be operated normally?

A. 60V B. 150V C. 225V D. 360V Correct Answer: Option A - 60V Explanation P = 40W R =…

5 years ago

Which of the following is an essential physical property of the wires uses for making fuses?

A. Low density B. Hypothermal conductivity C. Low electrical resistivity D. Low melting point Correct Answer: Option D - Low…

5 years ago

A man hears his echo from a nearby hill 2s after he shouted. If the frequency of his voice is 260Hz and the wavelength is 1.29m; how far away is the hill?

A. 330.0m B. 335.4m C. 660.0m D. 670.8m Correct Answer: Option B - 335.4m Explanation Recall V = F ×…

5 years ago

Which of the following concepts is not an evidence of the particles nature of matter?

A. Diffusion B. Brownian motion C. Diffraction D. Crystallization Correct Answer: Option D - Crystallization Explanation Diffusion is the net…

5 years ago

The product of force and time is?

A. Impulse B. Momentum C. Inertia D. Friction Correct Answer: Option A - Impulse Explanation An impulse is equal to…

5 years ago

Temperature is the property of a body which is proportional to the?

A. total kinetic energy of its molecules B. average kinetic energy of its molecules C. average speed of its molecules…

5 years ago

What flows to the earth by connecting the conductor to the earth?

A. Electrons B. Ion C. Neutron D. Proton Correct Answer: Option A - Electrons Explanation Ion: an atom with a…

5 years ago