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Question 1.
PHYSICS 2022 SEMESTER-2
Maximum Marks 40
Time allowed One and a half hours
Solutions from Saralvigyan Ventures Pvt Ltd (Funday.co.in)
Answers to this Paper must he written on the paper provided separately.
You will not be allowed to write during the first 10 minutes. This time is to be spent in reading the question paper.
The time given at the head of th s Paper is the time allowed for writing the answers. Attempt all questions from Section- A and any three questions from Section- B. The marks intended for questions or part of questions are given in brackets [ ]
Section-A
{Attempt all questions)

Choose the correct answers to the questions from the given options (Do not copy the question. Write the correct answer only.) [1OJ
(i) Free vibrations are•
(a) the vibrations under the influence of a periodic force
(b) the vibrations with larger amplitude
(c) the vibrations when the frequency continuously decreases
(d) the vibrations with a constant frequency and constant amplitude

(ii) The diagram below shows four sound waves. Which sound has the highest pitch?
(iii) The graph plotted for potential difference 01) against current (I) for ohmic resistors is•
(a) A curve passing through the origin
(b) A straight line not passing through origin

(c) A straight line passing through origin
(d) A circle centred at the origin
(iv) A main switch in the main distr bution board is present in :
(a) a live wire (b) a neutral wire
(c) a live as well as neutral wire (d) an earth wire
(v) A conductor AB is kept along north south direction of the earth above a magnetic needle as shown below. When the key K is closed then :

(a)
(b)
(c)
(d)

the needle will not show any deflection the needle will deflect towards east
the needle will turn in the opposite direction ie towards south the needle will deflect towards west
(vi) A coil wound around a piece of soft iron can become an electromagnet only when :
(a) the circuit is open
(b) a magnetic compass is present in the vicinity
(c) a galvanometer is connected to the circuit
(d) a current flows in the circuit
(vii) If water absorbs 4000 joule heat to increase the temperature of 1 kg water through 1°C then the specific heat capacity of water is
(a) 4 Jkg-1 oc-1
(c) 4 Jg-1 •c-1
bl 400 Jg-1 •c-1
(dl 4.2 Jg-1 •c-1
(viii) Water is used in car radiators because :
(a) it is a good conductor of heat
(b) it conducts heat faster as compared to the other substances and cools the engine quickly
(c) its specific heat capacity is very low.
(d) its specific heat capacity is very high so it can cool the engine without a greater increase in its own temperature
(ix) The heaviest nuclear radiation is :
(c)
X-radiation y-radiation

(b) a-radiation
(d) x-radiat on (x) To study the age of excavated material of archaeological s gn ficance we study the rate ofdecay of an isotope of
(a)
(c)
Uranium Carbon
(b) Cobalt
(d) Ch orine

Question 2.

Section-B
(Attempt any three questions from this Section )

(i) The diagram be ow shows a magnetic compass kept closer to a coil AB wound around a hollow cylindrical cardboard • [3]
(a) After studying the circuit and the magnetic compass carefully, state whether the switch S1 is open or closed.
(b) How did you arrive at the conclusion in (a)?
(c) What is the purpose of placing the magnetic compass in the above setup?
(ii) (a) Give an important reason for copper to be used as a material for a calorimeter.


(b) Calculate the thermal capacity of 40 g of water [Specific heat capacity of water= 4200 In the above circuit diagram, calculate
the external resistance of the cIrcuIt the current I2
the current I.Jlq{ 1 •c 11 ..]
Question 3.
(i) Three wires with proper colour coding are connected to the three terminals of a three pin socket Match the colour of the wire with the pro terminals A, B and C of the socket [3]

(a) Brown
(b) Green
(c) Light blue
(ii) (a) Why does it become colder after a hailstorm than during or before the hailstorm?
(b) "If two bodies have the same specific heat capacities, then they will always absorb the same amount of heat if their temperature increases by the same amount' State whether the given statement is true or false [3