Physics is all about how things work – from tiny atoms to big galaxies. Our SET 3 questions cover all sorts of cool stuff you're learning. It's like solving puzzles that make the world make sense.
But wait, there's more! We're not leaving you hanging. We've got the answers too. And not just the answers – step-by-step guides. It's like having a friend show you how to do cool tricks. So, you're not just learning the answers – you're becoming a physics champ!
Disclaimer:
Answers might be all correct. I took help of book, search engines, and teachers to solve the set. However, the language or process of solving the questions might be informal and in examinations, you might have to add little more language and show more calculations than what has been done here.
I highly encourage you to view these solutions as guide rather than just copying everything mentioned here.
GROUP - A: Multiple Choice Questions [11×1=11]
1. Dimensional formula of power is
a) [ML2T3] b) [MLT-2] c) [ML2T-2] d) [ML2T-3]
2. If an object is thrown vertically up with the initial speed u from the ground the
time taken by the object to return to ground is
3. No force is required for a body moving with:
a) constant velocity b) constant speed on circular path
c) constant acceleration d) variable acceleration
4. A 25 N box is pulled across a rough surface by an applied force of 22 N. The
coefficient of kinetic friction between the box and surface is 0.3. The acceleration
of the box is... (g = 10 m/s2)
a) 2.9 m/s2 b) 4.8 m/s2 c) 5.8 m/s2 d) 8.8 m/s2
5. In the given figure, the load versus extension curves of two
wires A and B are drawn. The dimensions of wire are the
same, but they are of different materials. The young’s
modulus is more for the wire.
a) A b) B c) Equal for both d) cannot be compared
6. The refractive index of glass is 1.5. What is the velocity of light in the material?
a) 3 × 108m/s b) 2 × 108 m/s c) 1.5 × 108 m/s d) 4× 108 m/s
7. In what unit is the power of lens measured?
a) Watt b) metre c) Dioptre d) Hertz
8. The image of real object formed by a device is always virtual and small. The
device may be:
a) convex lens b) concave mirror c) a glass plate d) convex mirror
9. In a thin prism of glass (μg = 1.5), which of the following relation between the
angle of minimum deviation (δmin) and the angle of refraction (r) will be correct?
a) δmin = r b) δmin = 1.5r c) δmin = 2r d) δmin =r2
10. The electric potential as a function of distance is given by V = (5x2 − 10x −9)volts. The electric field at x = 1 m would be
a) 20 V/m b) 11 V/m c) 6 V/m d) 0 V/m
11. When the temperature of silicon is changed from 100 °C to 0 °C, its
a) conductivity decreases b) conductivity remains constant
c) conductivity increases d) conductivity highly decreases
GROUP – B: Short Answer Questions [8×5=40]
1. (a) Define centripetal force. [1]
(b) A particle of mass 0.1 kg is rotated at the end of a string in a vertical circle of
radius 1.0 m at constant speed of 5 m/s. What is the tension in the string at the
highest point of its path? (Ans: 1.5 N) [3]
(c) If the string suddenly breaks, what is the direction of the path followed by the particle? [1]
OR
(a) State Newton’s laws of motion. [2]
(b) A body of mass 10 kg is moving with a constant velocity of 5 m/s on a
horizontal surface. The coefficient of sliding friction between the body and the
surface is 0.20. What horizontal force is required to maintain the motion? [2]
(c) If the force is removed, how soon will the body come to rest? [1]
2. (a) Define specific latent heat of fusion. [1]
(b) A mass of 24 g of ice at -15 °C is taken from a freezer and placed in a beaker
containing 200 g of water at 28 °C. Data for ice and water are given below:
water at 0 °C. (Ans: 8676 J) [2]
(ii) Assuming that the beaker has negligible mass, calculate the final temperature
of the water in the beaker. (Ans: 15.77 0C) [2]
3. (a) State Boyle’s law [1]
(b) Using Boyle’s and Charles’ laws derive the relation PV = nRT, where
symbols have their usual meaning. [3]
(c) A student needed to use the ideal gas for a certain experiment. But the ideal
gas does not exist. Suggest what two different things this student could do to
solve his problem. [1]
4. (a) The value of cubical expansivity of mercury is 1.8x10-5 °C−1. What does it
mean? [1]
(b) A steel tape measures accurate at 20 0C. It is used at 10 0C to measure a
kilometer distance. What reading will the tape show? (Linear expansivity of
steel is 12x10-6 K-1) [2]
(c) A meter scale made from metal does not give correct value of measurement at
all temperature. Why? Explain. [2]
5. (a) Explain clearly the term minimum deviation as applied to a prism. [1]
(b) Plot shows the experimental graph drawn by physics student using data
obtained in lab as variation of deviation angle with incidence angle (i.e. i-d
curve) for a prism
(i) What is the value of minimum angle of deviation? (Ans: 600) [1]
If you have any doubts, Please let me know