11th Second Unit Test Physics

 Second Unit Test 2021-2022

Std. XI Time-1 hrs.

Subject-Physics

Marks : 25   Pages-02

General Instructions: The question paper is divided into four sections 1) Section A: Q.No. I contains four multiple choice type of questions carrying one mark each

2) Que. No. 2 contains three very short answer type of questions carrying one mark each . Section B-Q.No.3 to Q.No.8 contains six short answer type of questions two marks each.

(Attempt any four) Section C: Q.No.9 to Q No. 11 contains three short answer type of questions carrying three marks each. (Attempt any two) 4) Section D: Q.12 & Q.No. 13 contains two long answer type of question carrying four marks each. (Attempt any one) 5) Use log table is allowed. Use of Calculator is not allowed. 6) Figures to the right indicate full marks 7) for each MCQ, correct answer must be written along with its alphabet. eg. (a).......(b)...... c)...... (d)....... only first attempt will be considered for evaluation.

SECTION-A

Q.1 Select and write the correct answer. 

1) For a particle having a uniform circular motion, which of the following is constant.

a) Displacement b) Speed c) Force d) Acceleration. 

2) Incase of elastic collisions which of the following is conserved.

a) Charge b) Mass c) Kinetic energy d) Displacement

3) S.I. unit of electric intensity is 

a) N/C b) NC c) Vm d) N/m

4) Internal resistance of an ideal power supply is...

a) Zero b) one c) infinity d) more than one.

Q.2 Answer the following questions. 3marks

 i) Define coefficient of restitution for collision of two objects.   

ii) What do you mean by electric flux?

iii) What is advantages of cells in series?

SECTION-B

Attempt the following. (Attempt any four) 8 marks

 Q.3 Distinguish between inertial and non-inertial frames of reference.

.Q.4 Define one coulomb from coulomb's law. 

Q.5 Define temperature coefficient of resistance. Give its S.I. Unit.

Q.6 A man throws a ball to maximum horizontal distance of 80m. Calculate the maximum height reached.

Q.7 A charged particle carrying a charge of 3.2 x 10-¹⁹ C experiences a force of 9.6 x 10¹N when it enters in some electric field. Find strength of electic field. 

Q.8 State and explain principle of superposition of electric charges.

SECTION -C

Attempt the following. (Attempt any two) 6 marks

Q.9 Derive an expression of period of a conical pendulum ?

Q.10 Explain importance of Newton's first law of motion. Q.11 Explain different types of electrical cell.

SECTION D

Attempt the following. (Attempt any one   )   4 marks.

Q.12 Derive the equation of motion for a projectile. Hence Show that the trajectory of a projectile is a parabola.

Q.13 State any four characteristics of electric lines of force. Find the force between two charges of magnitude 4uc and 6uc which are seperated by distance of Im.

1/4= 9 x 10° Nm²/C²)