4
Q:

# Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

 A) rough white B) rough black C) shining white D) shining black

Explanation:

Black  surfaces are good emitters of heat ( They are also good absorbers of heat). If the black surface is rough too, the emitting will be better. So (b) is the correct answer. Shining surfaces reflect back radiation. So if the black surface is also shining the effectiveness of emitting heat is lessened.

Subject: Physics
Q:

What is the noise level of normal conversation?

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

3 465
Q:

As an object falls freely its ___________________.

 A) kinetic energy gets converted into potential energy B) potential energy gets converted into kinetic energy C) momentum gets converted into gravitational force D) gravitational force gets converted into momentum

Answer & Explanation Answer: B) potential energy gets converted into kinetic energy

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 15141
Q:

Due to an acceleration of 1  $m/s2$, the velocity of a body increases from 5 m/s to 10 m/s in a certain period. Find the displacement (in m) of the body in  that period.

 A) 125 B) 37.5 C) 62.5 D) 75

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

3 502
Q:

What is measured with the Nephometer?

 A) volume of rainfall B) Cloud volume and speed C) Salinity of Sea D) All options are correct.

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 6017
Q:

What is the standard room temperature in Kelvin?

 A) 98 K B) 198 K C) 273 K D) 373 K

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 7045
Q:

An object, starting from rest, moves with constant acceleration of 4 m/s2. After 8 s, its speed is

 A) 16 m/s B) 8 m/s C) 32 m/s D) 4 m/s

Explanation:

Filed Under: Physics
Exam Prep: AIEEE , Bank Exams

1 388
Q:

1 watt is equal to 1 ____________

 A) J s-1 B) J s C) J s-2 D) J

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

2 6569
Q:

A body is initially moving with a velocity of 10 m/s. It undergoes an acceleration of 2 m/s2 for 5 seconds. Find the displacement (in m) of this body in these 5 seconds.

 A)  25 B)  37.5 C)  50 D)  75