3
Q:

# A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

 A) a parabola B) a horizontal straight line C) a vertical straight line D) a circle

Explanation:

Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

Subject: Physics
Q:

What is the noise level of normal conversation?

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

3 539
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 20383
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

3 627
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 8255
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 7833
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

1 507
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 9532
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