Lesson: Chapter - 19

Practice Questions
1. A train at rest has a length of 100 m. At what speed must it approach a tunnel of length 80 m so that an observer at rest with respect to the tunnel will see that the entire train is in the tunnel at one time?

(A) 1.25c

(B) 0.8c

(C) 0.64c

(D) 0.6c

(E) 0.36c


div>
2. A photon has 6.6 × 10-18 J of energy. Planck’s constant, h, is 6.6 × 10-34 J · s. The frequency of the photon is most nearly:
(A)  1.0 × 10-52Hz
(B)  1.0 × 10-16Hz
(C) 1.0 Hz
(D)  1.0 × 1016Hz
(E)  1.0 × 1052Hz


3. What happens to a stream of alpha particles that is shot at a thin sheet of gold foil?

(A) All of the particles pass straight through

(B) A few of the particles bounce back at 180º

(C) All of the particles bounce back at 180º

(D) Most of the particles are absorbed by the foil

(E) None of the particles are deflected by more than 45º


4. According to Bohr’s model of the atom, why do atoms emit or absorb radiation only at certain wavelengths?
(A) Because the protons and electrons are distributed evenly throughout the atom
(B) Because electrons can orbit the nucleus at any radius
(C) Because electrons orbit the nucleus only at certain discrete radii
(D) Because protons orbit the nucleus only at certain discrete radii
(E) Because photons can only have discrete wavelengths


5. An electron is accelerated through a particle accelerator and then ejected through a diffraction grating. By means of the diffraction experiment, it is determined that the electron’s de Broglie wavelength is 6.6 × 10-10 m. What is the electron’s linear momentum? Use Planck’s constant, h = 6.6 × 10-34  J · s.

(A) 1.0 × 10-44 kg · m/s

(B)  1.0 × 10-24 kg · m/s

(C)  1.0 × 1024 kg · m/s

(D)  2.0 × 1024 kg · m/s

(E)  1.0 × 1044 kg · m/s


6. Which of the following is the best definition of the uncertainty principle?

(A) We cannot know for certain when any given radioactive particle will undergo decay

(B) We cannot know both the momentum and the position of a particle at the same time

(C) The laws of physics are the same in all intertial reference frames

(D) Light exhibits both wave and particle properties

(E) An unobserved particle can be in two places at the same time


7. Which of the following particles is most massive?

(A) A proton

(B) A neutron

(C) An electron

(D) A beta particle

(E) An alpha particle

8. In the above nuclear reaction, what particle is represented by X?

(A) A proton

(B) An electron

(C) An alpha particle

(D) A gamma ray

(E) A beta particle

Questions 9 and 10 relate to the following graphs.

(A)
(B)
(C)
(D)
(E)


9. Which graph plots the activity of a radioactive substance as a function of time?


10. Which graph shows the half-life of a radioactive substance as a function of time?
Back Next

Next to display next topic in the chapter.

Practice Questions

Video Lessons and 10 Fully Explained Grand Tests

Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.

SAT Reasoning GRE General GMAT Test
More for You
MCQ with question Explanations Scholarships and Financial Aid

Analogies

Lessons and practice questions for Analogy section of the test

Logical/Critical Reasoning

Lessons on Logical/Critical Reasoning section of GAT, NAT, & GMAT

Biology for Test Preparation

Prepare Biology for tests with lessons and practice mcq

All in this Category

You may be interested in

PAF College Lower Topa

How to get admission in PAF College ...

Colleges in cities of Sindh

Comprehensive lists of colleges in ...

Fellowships News

Havw latest Fellowships News in you ...

Social Articles

A list of Articles on Social Issues ...

PPSC Exam for Posts of Inspector Legal

Learn about PPSC Exam for Posts of ...

PPSC Exam for Statistical Officer Exam

Learn about the exam of PPSC Exam f ...

Career in Agriculture

Universities offering programs in A ...

Universities in Faisalabad

Universities in city of Faisalabad ...

About us

EntryTest.com is a test preparation service for students seeking successful career.

About Disclaimer

Quick Test Prep

NUST NET IBA Karachi SAT LUMS LCAT LSE

 

NTS GAT NTS NAT GMAT GRE ACT

Study Abroad

Education Abroad Business Schools MS in USA