11th Physics - Book Back Answers - Unit 2 - English Medium Guides

 

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Tamil Nadu Board 11th Standard Physics - Unit 2: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 2 – Physics from the Tamil Nadu State Board 11th Standard Physics textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Physics Unit 2 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 11 students! Prepare well and aim for top scores. Thank you!

Unit 2:Kinematics

I. Multiple Choice Questions

1. Which one of the following Cartesian coordinate systems is not followed in physics?

Answer Key:

 

2. Identify the unit vector in the following.

(a) $\widehat{\mathrm{i}}+\widehat{\mathrm{j}}$

(b) $\frac{\widehat{\mathrm{i}}}{\sqrt{2}}$

(c)$\widehat{\mathrm{ k}}-\frac{\widehat{\mathrm{j}}}{ \sqrt{2}}$

(d) $\frac{\widehat{\mathrm{i}}+\widehat{\mathrm{j}}}{\sqrt{2}}$

Answer Key:

(d)$\frac{\widehat{\mathrm{i}}+\widehat{\mathrm{j}}}{\sqrt{2}}$

3. Which one of the following physical quantities cannot be represented by a scalar?

(a) Mass

(b) length

(c) momentum

(d) magnitude of acceleration

Answer Key:

(c) momentum

4. Two objects of masses m₁ and m₂ fall from the heights h₁ and h₂ respectively. The ratio of the magnitude of their momenta when they hit the ground is (AIPMT 2012

(a)$\sqrt{\frac{{\mathrm{h}}_1}{{\mathrm{h}}_2}}$

(b) $\sqrt{\frac{{\mathrm{m}}_1{\mathrm{h}}_1}{{\mathrm{m}}_2{\mathrm{h}}_2}}$

(c) $\frac{{\mathrm{m}}_1}{{\mathrm{m}}_{2 }}\sqrt{\frac{{\mathrm{h}}_1}{{\mathrm{h}}_2}}$

(d) $\frac{{\mathrm{m}}_1}{{\mathrm{m}}_{2 }}$

Answer Key:

(c) $\frac{{\mathrm{m}}_1}{{\mathrm{m}}_{2 }}\sqrt{\frac{{\mathrm{h}}_1}{{\mathrm{h}}_2}}$

5. If a particle has negative velocity and negative acceleration, its speed

 (a) increases

(b) decreases

(c) remains same

(d) zero

 Answer Key:

(a) increases

  

6. If the velocity is  $\overrightarrow{v}=2\widehat{\mathrm{i}}+{\mathrm{t}}^2\widehat{\mathrm{j}}-9\widehat{\mathrm{k}}$ , then  the magnitude of acceleration at t = 0.5

s is

(a) 1m s^-2

(b) 2 m s^-2

(c) zero

(d) -1 m s^-2

Answer Key:

(a) 1m s^-2

7. If an object is dropped from the top of a building and it reaches the ground at t = 4 s , then the height of the building is (ignoring air resistance) (g = 9.8 ms^–2)

(a) 77.3 m

(b) 78.4 m

(c) 80.5 m

(d) 79.2 m

Answer Key:

(b) 78.4 m

8. A ball is projected vertically upwards with a velocity v. It comes back to ground in time t. Which v-t graph shows the motion correctly? (NSEP 00-01)

Answer Key:

 

 

 

 

 

 

9. If one object is dropped vertically downward and another object is thrown horizontally from the same height, then the ratio of vertical distance covered by both objects at any instant t is

(a) 1

(b) 2

(c) 4

(d) 0.5

Answer Key:

(a) 1 

 

10. A ball is dropped from some height towards the ground. Which one of the following represents the correct motion of the ball?

Answer Key:

 

 

11. If a particle executes uniform circular motion in the xy plane in clock wise direction, then the angular velocity is in

(a) +y direction

(b) +z direction

(c) -z direction

(d) -x direction

Answer Key:

(c) -z direction

 

12. If a particle executes uniform circular motion, choose the correct statement (NEET 2016)

(a) The velocity and speed are constant.

(b) The acceleration and speed are constant.

(c) The velocity and acceleration are constant.

(d) The speed and magnitude of acceleration are constant.

Answer Key:

(d) The speed and magnitude of acceleration are constant.

 

13. If an object is thrown vertically up with the initial speed u from the ground, then the time taken by the object to return back to ground is

(a)$\frac{u^2}{2g}$

(b)$\frac{u^2}{g}$

(c)$\frac{u^{ }}{2g}$

(d)$\frac{2u^{ }}{g}$

Answer Key:

(d)$\frac{2u^{ }}{g}$

14. Two objects are projected at angles 30°and 60° respectively with respect to the horizontal direction. The range of two objects are denoted as R_30° and R_60°. Choose the correct relation from the following

(a) R_30°= R_60°

(b) R_30°= 4R_60°

(c)${\mathrm{R}}_{30°}=\frac{{\mathrm{R}}_{60°}}{2}$

(d) R_30°= 2R_60°

Answer Key:

(a) R_30°= R_60°

15. An object is dropped in an unknown planet from height 50 m, it reaches the ground in 2s. The acceleration due to gravity in this unknown planet is

(a) g = 20 m s^-2

(b) g = 25 m s^-2

(c) g = 15 m s^-2

(d) g = 30 m s^-2

Answer Key:

(b) g = 25 m s^-2

II. Short Answer Questions

11th physics

III. Long Answer Questions

11th Physics

IV. Exercise

11th Physics