12
Q:

# Hydrogen atom is excited from ground state to another state with principal quantum number equal to 4. Then the number of spectral lines in the emission spectra will be

 A) 2 B) 6 C) 5 D) 3

Explanation:

Number of spectral lines from a state n to ground state is

n(n-1)/2 = 6

Subject: Physics
Exam Prep: AIEEE
Q:

If the velocity of a body is doubled its momentum ________________.

 A) remains same B) doubles C) becomes half D) becomes 4 times

Explanation:

Filed Under: Physics
Exam Prep: AIEEE , Bank Exams

2 3466
Q:

A body of mass 8 kg is moving with a velocity of 4 m/s, find its momentum.

 A) 2 B) 64 C) 32 D) 4

Explanation:

Filed Under: Physics
Exam Prep: AIEEE , Bank Exams

0 3694
Q:

Ozone at the higher level of the atmosphere is a product of ______ acting on oxygen molecules.

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 5636
Q:

'Torr' is a unit of _______.

 A) force B) energy C) power D) pressure

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

6 4235
Q:

What is the velocity of sound in air?

 A) 343 m/sec B) 110 m/sec C) 220 m/sec D) 232 m/sec

Explanation:

Filed Under: Physics
Exam Prep: AIEEE , Bank Exams

4 4185
Q:

The power of a lens is —2.5 D. The type of lens and its focal length are respectively:

 A) Convex, -0.40 m B) Concave, -0.40 m C) Concave, 0.40 m D) Convex, 0.40 m

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 4292
Q:

Which one of the following is the unit of force?

 A) Pascal B) Watt C) Joule D) Newton

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 3449
Q:

Which of the following are Mechanical waves?

 A) X rays B) Radio waves C) Microwaves D) Sound waves