 # UP Board Important Questions for Class 11 Physics

Physics is a part of natural science. The UP Board Class 11 Physics syllabus, deals with topics like matter, force, energy, and motion. And if you have studied these topics in details, then you could easily relate it to the task of everyday life. Thus. Physics, plays a very important role in our life & it’s concepts define how everything works around us.

Mostly, students find this subject difficult to understand & therefore they lose interest in this. But if you are able to connect the laws & principle of Physics to our surrounding, then you will start liking Physics. To help all such students here we have provided the UP Board Class 11 Physics Important Questions. These Questions cover the entire UP Board Class 11 Physics Syllabus .You could even find the download PDF link further below in this page.

### How to Make Most of UP Board Class 11 Physics Important Questions

Scoring good marks in the UP Board Class 11 Physics subject is not a cup of tea. But, if you follow the right strategy, then you can easily score well in Physics exam. Here are a few tips for you:

1. Don’t just mug up the derivations & equations blindly.
2. Firstly, try to understand the concept, then practice the derivation by writing it paper.
3. The more you write, the more you learn in Physics.
4. Some of the Physics Class 11 UP Board Important formulas should be in your fingers tips.

Meanwhile, for the complete UP board 10th Class syllabus 2020, access from here.

Here are the set of important Class 11 Physics Questions of UP Board. You might find some of them in your annual exam.

The Questions number from 1 to 9 below carries 3 marks each:

Q1. What is the absolute error? The temperature of two bodies measured by a thermometer is t1 = 20°C ± 0.5°C and t2 = 50°C ± 0.5°C. What is the temperature difference and the error therein?

Q2. From the following graph, find the sign of

(i) Velocity (ii) Acceleration.

Q3. (i) Classify the following into conservative and non-conservative spring force, human push, gravitational force, viscous drag

(ii) The potential energy of a system due to a conservative for F is U. What is the relation between them?

Q4. State perpendicular axis theorem. What is the moment of inertia of a ring of mass 2 kg and radius 0.5m about an axis passing through its center and perpendicular to its plane? Also, find a moment of inertia about a parallel axis through its edge.

Q5. State Bernoulli’s theorem. Explain the lift on an airfoil using the theorem.

Q6. State the main features of the kinetic theory of an ideal gas.

Q7. Find the potential energy of a system of four identical particles placed at the vertices of a square of side a. Also, obtain the potential at the center of the square.

Q8. Explain why

(i) A body with large reflectivity is a poor emitter

(ii) Heating systems based on the circulation of steam are more efficient in warming a building than those based on the circulation of hot water.

Q9. What is a conservative force? Prove that gravitational force is a conservative and frictional force is non-conservative

The Questions number from 10 to 15 below carries 5 marks each:

Q10. (a) Force-time graph for a body is given below. What is the velocity of the body at the end of 11 sec? Mass of the body is 7 kg and assumes it to be initially at rest.

(b) When an automobile moving with a speed of 36 km/h reaches an upward-inclined road of angle 30°, its engine is switched off. If the coefficient of friction involved is 0.1, use an appropriate free body diagram to find the retardation suffered by the automobile.

Q12. Define angle of contact. For what nature of angle of contact will a

liquid wet the solid? A liquid drop of diameter 4 mm breaks into 1000 droplets of equal size. Calculate the resultant change in surface energy if the surface tension of the liquid is 0.07 N/m.

Q13. A displacement wave is represented by

y = 0.25 × 10-3 Sin (500t + 0.025 Hz)

where y, t and z are in cm, sec and m respectively.

Deduce the followings:

(i) The direction of travel of the wave.

(ii) Wave frequency

(iii) Wavelength

(iv) The wave speed

(v) Maximum particle velocity

Q14. (a) What is the Doppler effect? A whistle is being rotated in a horizontal circle. What will be the effect on the sound frequency for a listener standing

(i) outside the circle (ii) at the centre of the circle.

(b) What is the beat frequency when two tuning forks of frequency 200 Hz and 205 Hz are sounded together? Mention one application of beats.

Q15.

a) What is a projectile? Derive the expressions for the time of flight, and maximum height for the projectile thrown upwards at an angle θ with the horizontal direction.

b) The ceiling of a long hall is 25 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 ms-1 can go without hitting the ceiling of the hall?

To practice similar questions, download the subject wise UP Board Class 11 Previous Year Question Papers here!

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