SHRI. SANGAMESHWAR IND.

PU SCIENCE COLLEGE
BAGALKOTE
PU-I YEAR PREMIDTERM QUESTION PAPER (07-10-2024) PHYSICS
Max Marks: 70M

General Instructions:
1. All parts are compulsory.
2. Part A questions have to be answered in the first two pages of the answer-booklet. For Part - A questions, first
written-answer will be considered for awarding marks. 3. Answers without relevant diagram/figure / circuit wherever
necessary will not carry any marks.
4. Direct answers to the numerical problems without detailed solutions will not carry any marks.

PART-A
I. Pick the correct option among the four given options for ALL of the following questions. 15x1=15
1. The sum of the three numbers, 2.7543, 4.10 and 1.273, up to correct decimal places is
a) 8.1 b) 8.13 c) 8.1273 d) 8.127
2. The area between the velocity-time graph and the time axis is numerically equal to:
a) Velocity b) Distance c) Time d) Acceleration
3. If the slope of velocity-time graph gradually increases, then the body is said to be moving with:
a) Positive acceleration b) Negative acceleration c) Uniform velocity d) Variable velocity
4. Inertia of an object is quantitative measure of its:
a) Volume b) Density c) Mass d) Temperature
5. The resultant of two forces 30 N and 40 N acting at an angle of 90° with each other is
a) 30 N b) 40 N c) 50 N d) 70 N
6. Range of a projectile on a horizontal plane is same for the following pair of angles:
a) 300 and 600 b) 200 and 800 c) 00 and 450 d) 100 and 900
7. SI unit of impulse is:
a) 𝑘𝑔 𝑚 𝑠−2 b) 𝑁 𝑠 c) 𝑁 d) None of these
8. A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If
the collision is elastic, the velocity of the second snooker ball is:
`a) Zero b) Infinity c) V d) 2V
9. Work-energy equation can be expressed as:
a) 𝐹𝑎 = 𝐾. 𝐸𝑓 − 𝐾. 𝐸𝑖 b) 𝑚𝑎 = 𝐾. 𝐸𝑓2− 𝐾. 𝐸𝑖 2 c) 𝐹𝑑 = 𝐾. 𝐸𝑓 − 𝐾. 𝐸𝑖 d) 𝐹. 𝑉 = 𝐾. 𝐸𝑓 − 𝐾. 𝐸𝑖
10. Work done will be maximum if the angle between the force F and displacement d is.
a) 45o b) 90o c) 180o d) 0o
11. When torque acting on a system is zero, which of the following will be constant:
a) Linear momentum b) Force c) Angular momentum d) Impulse
12. Unit of angular velocity in SI unit is:
a) 𝑅𝑎𝑑./𝑠 b) 𝑚/𝑠 c) 𝑑𝑒𝑔𝑟𝑒𝑒/𝑠 d) 𝑅𝑒𝑣𝑜𝑙𝑢𝑡𝑖𝑜𝑛/𝑠
13. A gymnast sitting on stool with his arms out stretched lowers his arms:
a) The angular speed decreases b) The angular speed increases
c) Neither increases nor decrease d) Both increases and decreases
14. A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent
weight of the man is.
a) mg b) mg – ma c) mg + ma d) mg – ma
15. The dimensions of G are -
(A) ML3T–2 (B) M–1LT–2 (C) M–1L3T–2 (D) M–1L3T–2

II. Fill in the blanks by choosing appropriate answer given in the brackets for ALL the following
questions. (Momentum, Torque, Zeero, ms-2, Two, Infinity) 5X1=5
16. The SI unit of acceleration is ………..
17. Motion of projectile is …….. dimensional.
18. The net force acting on a body is zero then……………….. remains constant.
 19. The rate of change of angular momentum is ……….
20. Acceleration due to gravity becomes ………. at the centre of the earth.
PART-B
III. Answer any FIVE of the following 5x2=10
21. Mention any two constants which have dimensions.
22. Draw the position - time graph for an object (i) at rest (ii) with uniform motion.
23. Explain triangular law of vector addition.
24. Define impulse and write its expression.
25. What is conservative force? Give an example.
26. Mention any two factors on which moment of inertia depends.
27. Write position coordinates for a system of two particles in X-Y plane.
28. State and explain Newton’s Universal law of gravitation.
PART-C
IV. Answer any FIVE of the following 5x3=15
29. Derive the expression for time of flight of a projectile.
30. Show that path fallowed by the projectile is parabola.
31. Mention any three applications of friction.
32. What is meant by collision? Distinguish between elastic and inelastic collision.
33. When does work done is i) + ve ii) –ve iii) zero
34. Define (a) radius of gyration. (b) Moment of inertia (c) Mention the expression for moment of inertia in
terms of radius of gyration.
35. A flywheel of mass 12.5 kg and diameter 0.36m rotating at 90rpm has its speed increased to 720 rpm in 8s.
Find the torque applied.
36. State Kepler’s laws of planetary motion.
PART-D
V. Answer any THREE of the following 3x5=15
37. (a)What is v-t graph. (1)
2
(b) Derive the equation of motion x = v0 t + 1/2at using v-t graph. (4)
38. Obtain the expression for magnitude and direction for the resultant of two vectors making an
angle 𝜃 between them.
39. State Newton’s second law of motion and hence derive F=ma.
40. State law of conservation of mechanical energy. Show that total mechanical energy of a body falling freely
under gravity is conserved.
41. (i)State law of conservation of angular momentum. (1)
(ii) Explain it with any two illustrations. (4)
VI. Answer any TWO of the following 2x5=10
-1
42. A ball is thrown with velocity 45ms .The horizontal distance reached by the ball is 30m.Calculate (a) Angle
of projection (b) Maximum height reached by the ball.
43. Two balls each of mass 45g moving in opposite direction with a speed of 15ms-1 are collide and rebounds
with same velocity. Calculate the impulse imparted to each other.
44. A pump on the ground floor of a building can pump up water to fill a tank of volume 30m3 in 15min. If the
tank is 40m above the ground, and efficiency of the pump is 30%, how much electric power is consumed
by the pump? Given density of water = 1000 kg/m3 and acceleration due to gravity = 9.8ms-2.
45. Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down
to the centre of the earth if it weighed 250 N on the surface?

EVERYTHING HAPPENS FOR A REEASON AND THAT REASON IS USUALLY A PHYSICS