Physics - Study Mode

[#1206] Stars which appear single to the naked eye but are double when seen through a telescope are
Correct Answer

(B) binaries

Explanation

Solution: They are single to naked eye because they are far from us. But, if we see with telescope We can observe that there are two or double stars.

[#1207] The boiling point of water depends upon the
Correct Answer

(A) Atmospheric pressure

Explanation

Solution: The boiling point of water depends upon the atmospheric pressure.

[#1208] One bar is equal to
Correct Answer

(C) 10 5 Pa

Explanation

Solution: One bar is equal to 10 5 Pa.

[#1209] Pressure Cooker cooks faster because
Correct Answer

(C) Higher temperature is attained for cooking

Explanation

Solution: Food is cooked more quickly in a pressure cooker because at the higher pressure (1 bar/15 psi), the boiling point of water rises from 100°C (212°F) to 121°C (250°F). Since less water or liquid has to be heated, the food reaches its cooking temperature faster.

[#1210] In a particular system, the units of length, mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equivalent to
Correct Answer

(A) 0.1 N

Explanation

Solution: Mass = 10 g = 0.01 kg Length = 10 cm = 0.1 m Time = 0.1 s Force = mass × length/ time ^2 = > Force = 0.01 × 0.1 × 0.1 -2 = 0.1 N