Nios Physics (312) Tutor Marked Assignment 2021-22 Question paper

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Physics (312) -Tutor Marked Assignment 2021-22 

Note :

(i) All questions are compulsory. The Marks allotted for each question are given beside the questions.

(ii) Write your name, enrollment numbers, AI name and subject on the first page of the answer

1. Answer any one of the following questions in about 40-60 words.

(a) Two tuning forks A and B produce 10 beats per second. On loading a small ring on one prong of B again 10 beats per second are produced. What was the frequency of B before loading small ring if now frequency of B is 430 Hz. Give reason for your answer.

(b) Under what conditions, a stress is known as breaking stress? A load of 100 kg is suspended by a wire of length 1.0m. The wire is stretched by 0.20 cm. Calculate its cross sectional area if tensile strength is 9.8 × 107 Nm&2. Find strain in the wire. Given, g = 9.8 ms–2

2. Answer any one of the following questions in about 40-60 words.

(a) At what depth would the value of g be 75% of what it is on the surface of the earth? Does it change with height too?

(b) At what distance from the gun the bullet will strike the ground, if a bullet is fired with an initial velocity 250 ms–1 at an angle of 30º with the horizontal.

3. Answer any one of the following questions in about 40-60 words.

(a) Suppose we have a vector A and vector C = 12B. How is the direction of vector A × B related to the direction of vector C × A.

(b) A uniform circular disc of mass 2.0 kg and radius 20 cm is rotated about one of its diameters. Find angular speed about this diameter if angular momentum is 0.2 kgm2 s–1.

4. Answer any one of the following questions in about 100 to 150 words.

(a) Draw diagrams for concave mirrors of radii 5cm, 7cm and 10cm with common centre of curvature. Calculate the focal length for each mirror. Draw a ray parallel to the common principal axis and draw reflected rays for each mirror.

(b) What is meant by the resolving power of an optical instrument? Drawing suitable diagrams explain Rayhigh’s Criterion for the limit of resolution of two very close spectral lines. Write formula for the resolving power of (i) Microscope (ii) Telescope.

5. Answer any one of the following questions in about 100 to 150 words.

(a) What you understand by the term Wavelength. Calculate the Frequency and Time Period of a radio wave having its wavelength of 10m propagating in space.

(b) If you and your friend ride a bicycle on the road, you will notice that at different times the both bicycle are found at different positions. Note down five positions at five time intervals for each.

(i) Plot Position Time Graph for Uniform Motion.

(ii) Plot Position Time Graph for Non Uniform Motion

(iii) Take two plates A and B of same metal. Polish surface of A with black colour and surface of B with white colour. Take one electric heater and put polished black plate and white plate on vertical stand in such a way that polished black plate and white plate face the heater. Ensure that polished plates are equidistant from the heater. Fix one cork each with wax on the uncoated sides (back side) of the plates. Observe and comment which surface absorbs heat radiations more quickly; Black Plate Surface or White Plate Surface.

(iv) Take a small piece of stone and tie it to one end of a string. Hold the other end with your fingers and then try to whirl the stone in a horizontal or vertical circular path. Start with a small speed of rotation and increase it gradually. Observe and Comment –

(a) Do you feel any pull on your fingers when the stone is whirling?

(b) Observe the path of stone if the string breaks suddenly. Will it continue to move in same circular path or will change the path? Explain your answer with reasons.

Session 2021-22 (Physics&312)

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