Physics Test 38

Result

Physics Test 38

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Weekly Quiz Competition

Question 1
4 / -1

A rigid body rotates about a fixed axis with variable angular velocity equal to α-βt at time t, where α and β are constants. The angle through which it rotates before it comes to rest is :-

A
α²/ 2β

B
α^{2 -} β²/ 2α

C
α^{2 -} β²/ 2β

D
α ( α - β) / 2
Question 2
4 / -1

Oxygen boils at –183°C. This temperature is approximately :-

A
215°F

B
–297°F

C
329°F

D
361°F

Solution

F = 9/5 C+32
Question 3
4 / -1

When fluids are heated from the bottom, convection currents are produced because :-

A
Molecular motion of fluid becomes aligned

B
Molecular collisions take place within the fluid

C
Heated fluid becomes more dense than the cold fluid above it

D
Heated fluid becomes less dense than the cold fluid above it
Question 4
4 / -1

If the temperature of the sun is doubled the rate of energy received on earth will be increased by a factor of :-

A
2

B
4

C
8

D
16

Solution

Q₁ ∝ T⁴

Q₂ ∝ (2T)⁴

Q₂ = 16Q₁