PUNJAB GROUP OF COLLEGES( Send Up Exam)

PHYSICS HSSC-IName of Candidate.__________________ Sig. of Invigilator____________________

SECTION-ANOTE: Section-A is compulsory. All parts of this section to be answered on the question paper itself. It should be completed in the first 15 minutes and handed over to the Invigilator. Deleting/overwriting is not allowed. Do not use lead pencil.

Encircle the most suitable answers to all of the following MCQs (Marks 10×1=10)

1. Work done by a man, standing by holding a certain weight using 10N force, isa. positive b. negative c. Zero d. None of these

2. If the mass of an object is increased to four times and velocity becomes half, its K.Ea. becomes half b. is doubled c. remains same d. becomes eight folds

3. Continuity equation in fluids is actually the law conservation ofa. energy b. momentum c. mass d. both a & b

4. Mass flow rate of any fluid isa. Av b. V/t c. Av d. None of above

5. Work done per unit mass of a body isa. F. d b. mgh c. a . d d. F. v

6. Resultant of two equal but perpendicular vectors )say A( isa. A2 b. 2A c. A d. √2 A

7. A body of mass 1kg is dropped from a height 50 m. what is its KE 10 m below top?a. 490J b. 49 J c. 980J d. 98 J

8. In circular motion the angle between linear and angular velocity isa. 45o b. 90o c. 180o d. 0o

9. What is the work performed on an object in uniform circular motion?a. positive b. negative c. zero d. depends upon situation

10. A force of 200 N acts tangentially on the rim of a wheel 25 cm in radius. the torque isa. 5000 Nm b.

b50 Nm c.

c8 Nm d.

d314 Nm

11. If the acceleration due to gravity becomes doubled then new escape velocity becomesa 21/2 Vesc b 2Vesc c 4 Vesc d none of above12. The maximum height reached by a projectile projected with a velocity of 14 m/s at an angle of 30o with the horizontal isa 4 m b 1 m c 3 m d 2.5 m

PUNJAB GROUP OF COLLEGES( Send Up Exam)

PHYSICS HSSC-IName of Candidate.__________________ Sig. of Invigilator____________________

Time allowed: 1Hour 45 Minutes Total Marks Sections B and C: 40 NOTE: Answer any EIGHT parts from Section ‘B’ and any two questions from section ‘C’ on the separately provided answer

book. Use supplementary answer sheet i.e. Sheet-B if required. Write you answer neatly and legibly.

SECTION-BQ: 2 Write answers of any TEN questions. (10x 3 = 30)

i. if Ax= Ax i + Ay j + Az k & B= Bx i + By j + Bz k find A.Bii. write mathematical expressions for conditions of equlibrium

iii. A car accelerates along a road. Which force actually moves the car?iv. If one of the componts of a vector is non zero. Can its resultant be of zero magnitude?v. under what conditions a vector will have equal components?

vi. Can the velocity of a body reverse direction when acceleration is constant? If so, give an example.vii. Two masses m1 and m2 are initially at rest with a spring compressed between them. What is the ratio of

magnitude of their velocities after the spring has been released?viii. A 100g golf ball is moving to the right with a velocity of 20m/s . It makes a head on collision with an 8Kg

steel ball, initially at rest. Compute velocities of the balls after collision.ix. Show that the range of projectile is R= 2Vi Sin/gx. If a ball is thrown vertically upward with a velocity of 20m/s, it reaches its maximum height in 2s and

returns back to the initial point. Draw a vt-graph for this event.xi. What is ballistic missile? How it is related to projectile? xii. Write 2nd law of motion in terms of Momentum.

xiii. What is impulse? Write its formula and units.xiv. Show that P = F.Vxv. Show that AV= constant

xvi. Define following :i) Unit vector ii) Position Vector iii) Torque

iv) Displacement v)Null vector vi) angular displacement

SECTION-C Note:-Attempt any one question. 10 x 1 =10marks

Q: 3 a( What is dot product. write its characteristics (5)b) find the vector B having magnitude 5 and in direction of 2i +3j-k (3)c) a mass of 1kg experiences head on collision and its momentum changes from 20Ns to 21 Ns in 1 second . Find its impulse? (2)

PUNJAB GROUP OF COLLEGES( Send Up Exam)

PHYSICS HSSC-IName of Candidate.__________________ Sig. of Invigilator____________________

Q: 3 a( Define and explain projectile motion . Derive the relation fora( Time of flight b( Height. )1+2+2(

b( A truck weighing 2500kg and moving with a velocity of 21m/s collides with stationary car weighing 1000kg. The truck and car move together after the impact. Calculate their common velocity. )3( c( Define the terms instantaneous velocity and inst- acceleration. )2(