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1441. Which of the following statements are true regarding heat ? 1. Heat is a form of energy 2. Heat can be reflected by a mirror 3. Heat is an electromagnetic radiation4. Heat cannot pass through vacuum
A. 1, 2 and 3
B. 1, 2 and 4
C. 2, 3 and 4
D. 1, 3 and 4
Explanation:
1442. A permanent magnet repels :
A. ferromagnetic substances only
B. diamagnetic substances only
C. paramagnetic substances only
D. body paramagnetic and diamagnetic substances
Explanation:
1443. In T.V. transmission :
A. sound and video signals are transmitted simultaneously
B. sound is transmitted first and then the video signal follows
C. video signal is transmitted first, followed by sound signal
D. sound and video signals are transmitted from different places at the same time
Explanation:
1444. Burns caused by steam are much more severe then those caused by boiling water as :
A. steam is a gas and engulfs the body quickly
B. temperature of steam is higher
C. steam pierces through the pores of body quickly
D. steam has latent heat
Explanation:
1445. Machine parts get jammed in winter, because :
A. the viscosity of the lubricant used in machine parts increases with the decrease in temperature
B. the viscosity of lubricant used in machine parts decreases with the decrease in temperature
C. the inertia of machine parts decrease with the decrease in temperature
D. the inertia of machine parts increases with the decrase in temperature
Explanation:
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