HC Verma solutions, Concepts of Physics, Part 1,Chapter 4, THE FORCES, OBJECTIVE-II

"OBJECTIVE - II"

1. A neutron exerts a force on a proton which is 

(a)  gravitational  

(b) electromagnetic  

(c) nuclear 

(d) weak

Answer:    (a)  gravitational, (c) nuclear   

EXPLANATION:  Both have masses, so the gravitational force is exerted. When very close they will exert nuclear force. Without charge, they can not exert electromagnetic force and weak forces are experienced only inside protons and neutrons. 

2. A proton exerts a force on a proton which is 

(a)  gravitational  (b) electromagnetic  (c) nuclear (d) weak  

Answer:  (a)  gravitational, (b) electromagnetic  (c) nuclear   

EXPLANATION: Both have positive charges so electromagnetic forces will also be there.

3. Mark the correct statements: 

(a) The nuclear force between two protons is always greater than the electromagnetic force between them. 

(b) The electromagnetic force between two protons is always greater than the gravitational force between them.  

(c) The gravitational force between two protons may be greater than the nuclear force between them. 

(d) Electromagnetic force between two protons may be greater than the nuclear force acting between them. 

Answer: (b), (c), (d)  

EXPLANATION: Option (a) is not correct because the nuclear force is not always greater but only greater when very close like inside a nucleus. 

4. If all the matter were made of electrically neutral particles such as neutrons, 

(a) there would be no force of friction 

(b) there would be no tension in the strings    

(c) it would not be possible to sit on a chair  

(d) the earth could not move around the sun    

Answer: (a), (b), (c)  

EXPLANATION: Options (a), (b), (c) are due to electromagnetic forces but option (d) is due to the gravitational force which will be always there.

5. Which of the following systems may be adequately described by classical physics?   

 (a) the motion of a cricket ball 

 (b) the motion of a dust particle    

 (c) a hydrogen atom  

 (d) a neutron changing to a proton    

Answer: (a), (b)

EXPLANATION: Size of a hydrogen atom and neutron is much smaller than 10^-6  m so the motion of these particles can not be described by classical physics.

6. The two ends of a spring are displaced along the length of the spring. All displacements have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?  

(a) the right end is displaced towards the right and the left end toward left   

(b) both ends are displaced towards the right  

(c) both ends are displaced towards left  

(d) the right end is displaced towards left and the left end toward the right         

             

Answer: (a), (d) 

EXPLANATION: In the cases of (b) and (c) there is no change in the length of the spring, so there will be no tension or compression.

7. Action and reaction 

(a) act on two different objects  

(b) have equal magnitude   

(c) have opposite directions

(d) have resultant zero  

Answer: (a), (b), (c), (d)   

EXPLANATION: Action and reaction are the pair of forces applied by two objects on each other, they are equal in magnitudes but opposite in directions so their sum is zero.

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Links to the Chapters

ALL LINKS

CHAPTER- 19 - Optical Instruments

Questions for Short Answers

CHAPTER- 18 - Geometrical Optics

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES - Q 1 to Q10

EXERCISES- Q11 to Q20

EXERCISES- Q21 to Q30

EXERCISES- Q31 to Q40

EXERCISES- Q41 to Q50

EXERCISES- Q51 to Q60

EXERCISES- Q61 to Q70

EXERCISES- Q71 TO 79

CHAPTER- 17 - Light Waves

Questions for Short Answers

OBJECTIVE - I

OBJECTIVE - II

EXERCISES - Q1-Q10

EXERCISES - Q11-Q20

EXERCISES - Q21-Q30

EXERCISES - Q31-Q41

CHAPTER- 16 - Sound Waves

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES - Q-1 TO Q-10

EXERCISES - Q-11 TO Q-20

EXERCISES -Q-21 TO Q-30

EXERCISES -Q-31 TO Q-40

EXERCISES -Q-41 TO Q-50

EXERCISES -Q-51 TO Q-60

EXERCISES -Q-61 TO Q-70

EXERCISES - Q-71 TO Q-80

EXERCISES - Q-81 TO Q-89

CHAPTER- 15 - Wave Motion and Waves on a String

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES - Q-1 TO Q-10

EXERCISES - Q-11 TO Q-20

EXERCISES - Q-21 TO Q-30

EXERCISES - Q-31 TO Q-40

EXERCISES - Q-41 TO Q-50

EXERCISES - Q-51 TO Q-57

CHAPTER- 14 - Fluid Mechanics

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES- Q-1 TO Q-10

EXERCISES- Q-11 TO Q-20

EXERCISES- Q-21 TO Q-32

CHAPTER- 13 - Fluid Mechanics

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES Q-1 TO Q-10

EXERCISES- Q11 TO Q20

EXERCISES Q-21 TO Q30

EXERCISES Q-31 TO Q35

CHAPTER- 12 - Simple Harmonic Motion

Questions for Short Answers

OBJECTIVE-I

OBJECTIVE-II

EXERCISES- Q1 TO Q10

EXERCISES- Q11 TO Q20

EXERCISES- Q21 TO Q30

EXERCISES- Q31 TO Q40

EXERCISES- Q41 TO Q50

EXERCISES- Q51 TO Q58 (2-Extra Questions)

CHAPTER- 11 - Gravitation

Questions for Short Answers

OBJECTIVE - I

OBJECTIVE - II

EXERCISES - Q_1 to Q_10

EXERCISES -Q-11 TO Q-20

EXERCISES -Q 21 TO 30

EXERCISES -Q 31 TO 39

CHAPTER- 10 - Rotational Mechanics

Questions for Short Answers

OBJECTIVE - I

OBJECTIVE - II

EXERCISES - Q-1 TO Q-15

EXERCISES - Q-16 TO Q-30

EXERCISES Q-31 TO Q-45

EXERCISES Q-46 TO Q-60

EXERCISES Q-61 TO Q-75

EXERCISES Q-76 TO Q-86

CHAPTER- 9 - Center of Mass, Linear Momentum, Collision

Questions for Short Answers

Objective - I

Objective - II

EXERCISES Q-1 TO Q-10

EXERCISES Q-11TO Q-20

EXERCISES Q-21 TO Q-30

EXERCISES Q-31 TO Q-42

EXERCISES Q-43 TO Q-54

CHAPTER- 8 - Work and Energy

Click here for → Question for Short Answers

Click here for → OBJECTIVE-I

Click here for → OBJECTIVE-II

Click here for → Exercises (1-10)

Click here for → Exercises (11-20)

Click here for → Exercises (21-30)

Click here for → Exercises (31-42)

Click here for → Exercise(43-54)

CHAPTER- 7 - Circular Motion

Click here for → Questions for Short Answer 

Click here for → OBJECTIVE-I

Click here for → OBJECTIVE-II

Click here for → EXERCISES (1-10)

Click here for → EXERCISES (11-20)

Click here for → EXERCISES (21-30)

CHAPTER- 6 - Friction

Click here for → Questions for Short Answer

Click here for → OBJECTIVE-I

Click here for → Friction - OBJECTIVE-II

Click here for → EXERCISES (1-10)

Click here for → Exercises (11-20)

Click here for → EXERCISES (21-31)

For more practice on problems on friction solve these- "New Questions on Friction".

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CHAPTER- 5 - Newton's Laws of Motion

Click here for → QUESTIONS FOR SHORT ANSWER

Click here for→ Newton's laws of motion - Objective - I

Click here for → Newton's Laws of Motion - Objective -II

Click here for → Newton's Laws of Motion-Exercises(Q. No. 1 to 12)

Click here for→Newton's Laws of Motion,Exercises(Q.No. 13 to 27)

Click here for→Newton's Laws of Motion,Exercises(Q.No. 28 to 42)

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CHAPTER- 4 - The Forces

The Forces-

"Questions for short Answers"    

Click here for "The Forces" - OBJECTIVE-I

Click here for "The Forces" - OBJECTIVE-II

Click here for "The Forces" - Exercises

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CHAPTER- 3 - Kinematics - Rest and Motion

Click here for "Questions for short Answers"

Click here for "OBJECTIVE-I"

Click here for EXERCISES (Question number 1 to 10)

Click here for EXERCISES (Question number 11 to 20)

Click here for EXERCISES (Question number 21 to 30)

Click here for EXERCISES (Question number 31 to 40)

Click here for EXERCISES (Question number 41 to 52)

CHAPTER- 2 - "Vector related Problems"

Click here for "Questions for Short Answers"

Click here for "OBJECTIVE-I

Click here for "OBJECTIVE-II"

Click here for "Exercises"