CBSE Class 11 Physics Question Paper Set 19 Solved

1 Write the four fundamental forces in the ascending order of their strength? 

2 Arrange in ascending order- astronomical unit, parsec and light year. 

3 Write down the dimensional formula for universal gravitational constant. 

4 State the number of significant figures in (a) 0.007m (b) 2.67 X 10^-24kg 

5 A body of mass 3Kg moves with an acceleration 3ms^-2 for 2 seconds. Calculate the change in momentum.

6 Convert 100N into dyne using dimensional analysis. 

7 (a)The v-t graphs of two objects make angles of 30⁰ and 60⁰ with time axis. Find the ratio of their accelerations.

(b)If the displacement –time graph for a particle is parallel to time axis, how much is the velocity of the particle?

8 Two bodies are projected at angles θ and (90⁰ – θ) to the horizontal with the same speed. Find the ratio of their times of flight.

9 Using velocity time graph, derive v² – u² = 2as. 

10 A cricketer can throw a ball to a maximum horizontal distance of 100m. How high above the ground can the cricketer throw the same ball?

11 Show that Newton’s second law motion is the real law of motion.

12 A monkey of mass 40Kg moving in a row up and down. If the rope can withstand max.tension of 600N in which of the following cases the rope may break.

(i) Climbing up with an acceleration of 6m/s²
(ii) Climbing down with uniform velocity 5m/s
(iii)Climbing down with an acceleration of 4m/s²
(iv)Freely falls down the rope.( a = g )
                            OR
Find the relation between Impulse and momentum.

13 Assuming that the mass m of largest stone that can be moved by a flowing river depends on the velocity v, the density of water p and acceleration due to gravity g. Show that m varies as the sixth power of the velocity of flow.

14 (a)Define light year and express it in meters.

(b) If x = a + bt + ct², where x is in metres and t is in seconds. What are the units of b and c?

15 Explain Parallax method for determining the distance of a nearby star?
                          OR
The time period of oscillations of a simple pendulum in an experiment is recorded as 2.56s, 2.62s, 2.70s, 2.58s, and 2.45s respectively. Find the mean time period, absolute error in each observation and the percentage error3

16 Draw the following graphs between distance – time of an object in case of

(i) For a body at rest.
(ii) For a body moving with uniform velocity.
(iii)For body moving constant acceleration.

17 A race car accelerates on a straight road from rest to a speed of 180kmph in 25 seconds. Assuming uniform acceleration of the car throughout, find the distance covered in this time.

18 Prove that maximum horizontal range is four times the maximum height attained by the projectile, when fired at an inclination so as to have maximum horizontal range.

19 (a) Define unit vector.
(b) Prove that the vectors A = 2i – 3j – k and B = -6i + 9j + 3k are parallel.

20 Define angle of repose. Deduce its relation with coefficient of static friction. 

21 A man of mass 75Kg is standing on a weighing scale on the floor of the elevator. Find
(i) Apparent weight
(ii) Reading of the scale when the elevator is at rest.
(iii) Reading of the scale when the elevator has downward acceleration 5m/s²

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