Physics Questions

The switch shown in the figure has been opened for long time and closes at t 0 Find V t for all t 8A 1 VR 10Q2 X t 0 2092 1 F 2002

A particle direction is moving on a straight line along A graph between square of velocity position is drawn as shown Find t magnitude of acceleration in m s of particle v m s 100 25 x m

Two coherent monochromatic light waves of amplitude 3A and 2A interfere at a point on screen having a phase difference of rad The resultant intensity at that point will 3 be proportional to 5 A 13 A 19 A

1 Assertion A The drift velocity of electrons in a metallic conductor decreases with rise of temperature of conductor Reason R On increasing temperature the collision of electrons with lattice ions increases this hinders the drift of electrons

given We have to find the total resistance of i t The answer to this is that in this circuit short circuit will happen please give a detailed solution of this q uestion This question is of higher level than cla ss10 Voltage of bathry is a Nett R 22 WM R 1222 Rg d R 222 R R 108 10

One mole of an ideal gas having initial volume V pressure 2P and temperature T undergoes a cyclic process ABCDA as shown below The net work done in complete cycle is Pressure A P 1 T D A T B 2T Temp 2 2 RT 3 RT In 2 4 RT In 2

1 A 25KVA single phase transformer has 500 turns on the primary and 50 turns on the secondary winding The primary is connected to a 2500V 50Hz AC supply The flux density is 22 5T Determine a Secondary voltage and current on open circuit b Current flowing through the two windings on full load c Maximum value of flux and area of cross section of core

A fighter plane enters inside the enemy territory at time t 0 with velocity vo 250 ms and moves horizontally with constant acceleration a 20ms 2 see figure An enemy tank at the border spot the plane and fire shots at an angle 0 60 with the horizontal and with velocity u 600 ms At what altitude H of the plane it can be hit by the shot 1 600 ms 60 a 1500 3m D b 125 m 1400 d 2472 m

Q21 The spectrum of a black body at two temperatures 27 C and 327 C is shown in the figure Let A and A be the areas under the two curves respectively The value of A2 A is Intensity A 327 C 27 C Wavlength L a 1 16 b 4 1 c 2 1 d 16 1

157 Two bodies are projected from the same point with equal speeds in such directions that they both strike the same point on a plane whose inclination is If x be the angle of projection of the first body with the horizontal the ratio of their times of flight is COS X sin x 3 b sin x B a COS X COL c COS X sin x B d sin x B COS X

31 The reactance of a capacitor is 2 ohm and that of an inductor is 3 ohm 1 poin If they are connected in series with a resistor of 1 732 ohm the angle of phase with which voltage ma lead the current is OA 0 degree B 30 degree OC 45 degree O D 90 degree

The atom contains part of an element is called nucleus The extranuclear part of the charged are called isotopes charged Atoms of the same elements with different number of Nucleus contains and electrically particles

In a given set up a compound microscope is forming the image of an object placed at a distance x from its objective at infinity If the focal lengths of its objective and eyepiece are 5 cm and 20 cm respectively and tube length is 50 cm then x equals O 6 cm 0 7 cm O 8 cm O 5 5 cm

The following histogram represents the binding energy per particle B E A in MeV as a function of th mass number A of a nucleus B E A 2 A 180 MeV of energy is released C 360 MeV of energy is released 0 40 80 120 160 200 A A nucleus with mass number A 180 fissions into two nuclei of equal masses In the process B 180 MeV of energy is absorbed D 360 MeV of energy is absorbed

For the equilibrium condition shown the chords are strong enough to withstand a maximum tension 100 N What is the largest value of W in Newton that can be suspended 53 A 53 W Question Type Numerical Type

Q1 A stone is accelerated upwards by a cord whose breaking strength is three times the weight of the stone The maximum acceleration with which the stone can be moved up without breaking the cord is A 8 B 28 C 3g

When a pin is moved along the principal axis of a small concave mirror the image position coincides with the object at a point 0 5 m from the mirror refer figure If the mirror is placed at a depth of 0 2 m in a transparent liquid the same phenomenon occurs when the pin is placed 0 4 m from the mirror The refractive index of the liquid is A 6 5 H B 5 4 0 2 m 0 2 m C 4 3 D 3 2

The disc of mass M with uniform surface mass density is shown in the figure The centre of mass of the quarter disc the shaded area is at the position x a x a 3 3 Round off to the where x is Nearest Integer a is an area as shown in the figure Y a X

in reality I am rest outside an I am inertial frame of reference I get a valid equation but when acclerated person saw me he saw I am non innertial frame so he get another equation both two equation are not equal then the person has to go through the rest or get out of the car to get a valid equal equation otherwise the results of Newton s law is invalid by acclerated person Am I right

Identify the correct statement regarding Topologies of network You can select multiple correct answers In a mesh topology installation and management are easy In a ring topology if one of the nodes are damaged it will damage the whole network Star Topology all the nodes are connected to one single node known as the central node In a bas topology If the main cable gets damaged it will not effect the whole network

Two observers A B are observing a fish in water u 4 3 Observer A is observing directly but observer B is observing through a lens of focal length 20 cm Given diagram shows the distance at particular instant At this instant IEEEEEEEE A B C D 40cm A be B 20 m s P f 20cm cm from interface 30cm 4 3 Distance of image as observed by A will 160 3 1 Distance of image as observed by A will be 30 cm from interface Velocity of image as observed by A will be 15 m s towards interface Observer B will observe the final image of fish at a distance of 30 cm from lens

ss and radius of the Earth are 6 0 x 1024 kg and 6 4 x 106 m respectively The accelerat ced in the body of mass 1 kg and acceleration produced in the Earth are 9 8 m s and 1 m s a respectively C 1 63 x 10 24 m s and 9 8 m s respectively b d 9 8 m s and 1 63 x 1024 m s respectively 9 8 m s for both

Intensity wavelength graph of x ray is shown in the figure If accelerating potential is increased then I 1 Question Type Single Correct Type 2 kt 3 d and d both will increase d and d both will decrease d increases and d2 remains unchanged de increases and d romains unchanged

Unstable radioactive nuclei of A are being formed at the rate of r atoms per second which have a disintegration constant of per second At t 0 there were no elements of A 1 A unstable At radioactive equilibrium for A the number of elements of A is found to be No Hence the average life of A is 1 2 3 Both 1 and 2 B stable 2 2 2 4 N

Q A roller of weight W 4450 N rests on a smooth inclined plane and is kept from rolling down by a string as shown in the figure Find the tension S in the string and the reaction R at the point of contact B W 15 45

In the figure shown battery I has em nal resistance 102 Battery 2 has emf 2V ar internal resistance 302 The wires have negligib resistance What is the potential difference acro the terminals of battery 2 1 4V IA 6V 12 ww 32 www b 2 2 1 5V

Pick up the correct statement regarding bandwidth delay product The time required for transmission of message depends on the size of the message OIt is queuing time needed for each intermediate time O Bandwidth and delay are two performance matrix of a link O Its is time how long it takes for an entire message to Lompletely arrive at the destination

A body cools from 60 C to 40 C in 10 minutes If the room temperature is 10 C and assuming Newton s cooling law holds good find the time taken to cools from 40 C to 20 C A B D 20 min 30 min 40 min 50 min

30 A monkey can jump a maximum horizontal distance of 20 m Then the velocity of the monkey is a 10 ms c 20 ms b 14 ms 1 1 d 24 ms 31 A ball is projected with kinetic energy K at an angle of 45 to the horizontal At the highest point during

Consider a conductor of variable cross section in which current is flowing from cross section 1 to 2 Then which of the following statement is correct A current passing through both the cross section is the same B Current through 1 is less than that through 2 C Drift velocity of electrons at 1 is less than that at 2 D Drift velocit at both the groce contionn

Circuit diagram of metre bridge is shown in figure The null point is found at a distance of 40 cm from A If now a resistance of 120 is connected in parallel with S the null point occurs at 64 cm Determine the value of R and S R S B AG A metaller ale mal matemala un buralaukurall X Question Type Single Correct Type

A capacitor of capacitance 1 F withstands the maximum voltage 6 kV while a capacitor of 2 F withstands the maximum voltage 4 kV What maximum voltage will the system of these two capacitor withstands if they are connected in series 10 kV 2 12 kV 3 8 kV 4 9 kV

Deuterium fusion reaction is given by H H 2He n 3 27 MeV How long can a 100 W electric lamp be kept glowing by the fusion of 2 kg of Deuterium Given 1year 3 16 x 107 seconds A 500 years B 5 000 years C 50 000 years D 5 00 000 years C

A man is running a race on a straight track where a wind is blowing with constant velocity perpendicular to the track in horizontal direction Just after man starts running he finds wind is blowing at an angle a 45 with the track relative velocity of wind with respect to man By the time man completes the race wind rotates THROUGH an angle 45 Man Top view of track velocity of wind with respect to man A During the race man is slowing down B During the race man is speeding up C Man stops just at the finish line D Man crosses the finish line running

compound microscope has angular magnification equal to 100 If the object subtends an angle of 0 06 to the eye then then angle subtended by the image to the eye will be O 6 O60 O 0 06 O 0 2

Select true statement for repeater A repeater is a regenerator not an amplifier A A repeater has a table used in filtering decisions Repeaters can operate in physical link as well as data link layer Repeater connects segments of WAN

The current I through the 4ohm resistor in the network sh own in figure is The current I through the 40 resistor in the network shown in figure is S W 5 100 to A ONE 1 2 A 3 2 5 A 10V 29 ww 10V 20 www 452 I B 2 4A 4 1 25 A 2 31 5 4 2x2

Identify the correct statements in context of presentation layer Statement 1 In this layer the number of bits contained in the information is reduced Statement 2 It determines the transmission speed in network O Statement 1 and Statement 2 both are correct Statement 2 is correct Statement 1 and Statement 2 both are incorrect Statement 1 is correct

Q3 A wire with circular cross section is melt and again streched into a wire with square cross section of sar length New ressistance of wire compared to old will be a Increased c Remain same b Decreased d Insufficent date ff Junction rule is based on

0 A person standing on the floor of an elevator 10 drops a coin The coin reaches the floor in time t if the elevator is at rest and in time t if the elevator is moving uniformly Then 1 t t or t t depending upon whether the lift is going up or down 2 1 1 3 1 1 4 t t fefe fer foran f farve faze se af fer fetter at garanta 1 1 1 3 for an 2 1 1 3 1 4 L fante a for f sate

What is the purpose of gateway O None of the mentioned purpose gateways are used O The forwarding of the data packet is done from one router to the other which basically forms a network 4 The main function of a gateway is to translate one protocol to the other O Determines the destination or the target IP address of the packet

The radius of a charged conducting sphere P is half that of a conducting sphere Q They are connected by a conducting wire The ratio of the electric field on the surface of P to that on the surface of Qis A 1 2 B 2 1 C 1 2 D 5 1

Find the angular frequency of SHM of block of mass m for small oscillation of light rod BD Consider rod is vertical and springs relaxed in initial state RE k k c mikic k b c k D 6000000 m moo k 6000000 1 600 B Figure 5 88

4 balance cannot be obtained The length of a potentiometer wire is A cell of 38 emf E is balanced at a length 1 3 from the positive end of the wire If the length of the wire is increased by E 2 At what distance will the same cell give a balance point 20 0 2 3 3 In the metre hridge experiment resistances are 39 4 Wal gafavaut are f 3E gford at an and at eft 1 20 2 fagd als de ch afe are 1 2 tea fer sa tigan atas fa 40 3 g gay face and 3

A straight conductor and a conducting square loop of side a are kept as shown in the figure If the distance between the centre of the loop and the straight conductor is b the mutual inductance between them is A Hoa In 2 B C b a 2 b a 2 M b b a 2 In 2 b a 2 Ho In b a 2 2 a b a 2 b a 2 Ho D In b a a

In the metre bridge experiment resistances are 39 27 g v f u fara connected as shown in the following figure The balancing length is 55 cm Now an unknown resistance x is connected in series with P and the new balancing length is found to be 75 cm The value of x is P30 54 1 2 13 100 48 B 2 20 3 DER TEST SERIES JOINT PACKAGE COURSE 4 48 1 X 5 P 75 x P 30 100 2 3 48 B 11 48 0999DMD310320002 4

The advantage of circuit switching is More bandwidth is required in setting up dedicated channels O It can be used to transmit any other data even if the channel is free as the connection is dedicated to circuit switching O It takes a short time to establish a connection O It is a committed transmission channel is established between the computers which give a guaranteed data rate

A copper wire is length and radius r is nickel plated till its final radius is R and length 1 If the specific resistance of nickel and copper be K and K then the conductance of the nickel copper wire is z R r IK IK B IK A IK 7 K D T R

A rod AB slides on V shaped wire with speed v in magnetic field B such that at an instant OA OB L If the induced emf in the loop OAB at this instant is given by Bvl then find the value of n A 90 B V

A conducting rod of length is rotating with angular velocity w about axi through end O and perpendicular to the rod A uniform magnetic field Bo exists out of the plane of the paper The potential difference Vp Vo will be 09 E 3 4B 00 9 4B 00 9 2B 0 9 2B 00 9