Basic Physics Questions and Answers

D A magnetic needle of weight W has a magnetic moment m If the needle is to be maintained horizontal in northern hemisphere where should the point of support lie relative to its centre of gravity Vertical component of earth s magnetic field is V and horizontal component of earth s magnetic field is H a m V W Support 9 V X 21 C G W b Im V mW H

953 as OTH 4 370 93 If 31 Ax B 4A B then value of L B is 1 2 3 V5 4 35 25 45 V5 2 5 2AB Sing 1 4 5 94 If body perfoms translatory motion then 3 90 4 37 93 f3 AXB 4 1 5 APD 2 3 4 3 5 12 1 3 AB Sint 4ABG O Jand y 37 94 Prva fa ad al 54 4

1 1 67 x 10 T 1 3 Zero 2 1 67 x 10 T 1 1 1 67 10 T 1 3 Zero of 40 oscillations of a pendulum is measured to be 50 second The maximum percentage error in the measurement of time will be 1 0 4 2 4 3 0 8 4 8 1 Q 113 The least count of a stop watch is s The time Q 113 IC 5 40 50 2 1 67 10 T i 1 0 4 3 0 8 for free fearfi 2 4 4 8

ng these resistance values R1 100 N R2 30 N R3 56 Q2 R4 52 Q Solve for the current in the following circuit with these resistance values R 100 2 R 30 R 56 R 52 N Express your answer with the appropriate units I A Value A 10V R R www RA

A vessel contains a mixture of two gases The volume of vessel is 2000 cm temperature 300 K and pressure 100 kPa The number of moles of gasses is 100 X approximately Find the value of x to the nearest integer gch ya a tai 6 Agu 21 q2000 300 100 ka T 1 Acca quich ATHT Mari 24 X 100 00

2 A particle is moving along x axis with speed 10 m s An acceleration of 10 m s2 along y axis is applied on the particle then speed of particle just after 1 s is S 1 10 m s 10 3 m s 2 2 20 m s 4 10 2 m s

The rate of a first order reaction is 2 5 x 10 3 mol L 1 min 1 at 0 25 M concentration of reactant The half life in min of the reaction is 69 3 43 5 76 6 38 7

In a new system of units the unit of mass is 10 kg unit of length is 100 m and unit of time is 1000 s then the value of m 10 kg 10 103 104 in this new system will be

52 When an n p n transistor is used as an amplifier AIEEE 2004 AIPMT 1996 a holes move from emitter to base b holes move from base to emitter c electrons move from base to collector d electrons move from collector to base

A and B are two metallic rings placed at opposite sides o an infinitely long straight conducting wire as shown I current in the wire is slowly decreased the direction o the induced current will be A B 1 clockwise in A and anticlockwise in B 2 anticlockwise in A and clockwise in B 3 clockwise in both A and B 4 anticlockwise in both A and B

6 31 A pendulum beats seconds on the surface of the Earth Calculate as to how much it loses or gains per day if it is taken to a a mine 8 km below b a point 8 km above the surface Radius of the Earth 6 4 100 m Ans a 54 sec b 107 9 sec

73 A cubical tank of edge I and its position are shown in the figure When the tank is empty edge of the bottom of the tank is just visible An insect is at center C of its bottom surface To what height 5 a transparent liquid of refractive index 2 must be poured in the tank so that the insect will become visible 1 3 3 C 1 2 4 2

A light rigid tube is welded along a diameter of a uniform cylindrical pipe of mass M and radius r A bead of mass m connected by two identical light springs each of force constant k can slide inside the tube Other ends of the springs are connected to the pipe as shown in the figure The pipe is held motionless on a horizontal floor the bead is pulled aside a distance x away from the centre of the pipe and then the pipe and the bead both are released simultaneously If the cylinder rolls without slipping on the ground if acceleration of its centre immediately after the system is released is a x 10 7 m s Find a if x 1 cm 10 r 4 cm m 10 4kg M kg k 32 1 80 N m wwwwww voor o o o o o o o

A boat is moving in a river with a speed of V wrt water The water is flowing with a speed u At time t 0 the boat is at the origin of a co ordinate system with x y axes in the horizontal plane and positive x axis in the opposite direction of the flow of water The boat has to reach the point P x y as shown in figure The boat starts in a direction inclined at an angle ky x y to P The value of k is Y sin 1 u V P x y to the line joining O um s

matl Q8 27 July 2021 Shift 1 mathongo mathongo mathongo mathongo mathongo mathengo Assertion A If A B C D are four points on a semi circular arc with centre at O such that AB BC CD then AB AC AD 4AO OB OC mathongo mathongo mathongo mathongo mati Reason R Polygon law of vector addition yields AB BC CD AD 2AO thongo mathongo mati mathongo A B D mong mathongo mathongo mathongo mathongo mathongs mat C mathongo mathongo mathongo mathongo mathongo mathongo mati In the light of the above statements choose the most appropriate answer from the options given below mathongo mathongo mathongo mathongo mati mathongo mathongo 1 A is correct but R is not correct 2 A is not correct but R is correct mathongo mathongo mathongo mathongo mati 3 Both A and R are correct and R is the correct explanation of A mathon nathongo 4 Both A and R are correct but R is not the correct explanation of A mathoneo mathongo mathongo mati

Q8 27 July 2021 Shift 1 mathongo mathongo mathongo mathongo mathongamathongo mati Assertion A If A B C D are four points on a semi circular arc with centre at O such that AB BC CD then AB AC AD 4A0 OB OC mathongo mathongo mathango mathongo mati mati ason R Polygon law of vector addition yields AB BC CD AD 2Aathongs mathongo D 12 mong mathongo mathongo mathongo mathongo mathongo mati B C mathongo mathongo mathongo mathongo mathongo mathongo mati In the light of the above statements choose the most appropriate answer from the options given below mathongo mathongamathongo mathongo mathongo mathongo matl 1 A is correct but R is not correct 2 A is not correct but R is correct mathongo mathongo mathongo mathongo 3 Both A and R are correct and R is the correct explanation of A ongo mathongo mathongo 4 Both A and R are correct but R is not the correct explanation of A mathango mathongo mathongo mati

11 The magnetic field induction produced at the centre of orbit due to an electron revolving in nth orbit of hydrogen atom is proportional to 1 2 m 5 3 n5 4 n X Go

tensions The relation is a Tx b Tx prs c Tx d Tx A vernier calipers has 1 mm marks on the main scale It has 20 equal divisions on the vernier scale w match with 16 main scale divisions For this vernier calipers the least count is b 0 05 mm c 0 1 mm a 0 02 mm d 0 2 mm

Q 91 A U tube contains water and oil separated by Q 91 mercury Height of mercury in the two arms are same and is with 10 cm of water in one arm and 12 5 cm of oil in the other as shown in figure What is the relative density of oil 10 cm 1 1 25 3 1 0 2 5 cm 2 0 8 4 1 5 U furt er der er ar geras at gumi on 12 5 cm en fara 10 cm 10 cm auf en 1 1 25 3 1 0 2 5 cm 2 0 8 4 1 5

6 A rectangular loop of sides 20 cm and 10 cm carries a current of 5 0A A uniform magnetic field of magnitude 2T exists parallel to the longer side of the loop The torque acting on the loop is 2 0 3 Nm 4 3 Nm 1 0 2 Nm 3 2 Nm

A car starts from rest travelling with constant acceleration If distance covered by it in 10th second of its journey is 19m what will be the acceleration of car A 4 m s C 2 m s B 3 m s D 1 m s

English En A rectangular metal loop ABCD is passed through the magnetic field with a constant velocity v Which of the following represents power P dissipated vs time t graph V B C ha 100 1 PA

he count rate of a radioactive sample was Q 72 600 count s at t 0 and 100 count s at t 8 Select the correct option 1 Its count rate was 400 count s at t 2 s 2 Half life of the sample is 2 88 s 3 Mean life of the sample is 4 s 1 Its count rate was 200 count s at 1 6 s der inritule 35 2131420 47 Ut 0 1600 8100 for 1 t 2s400 2 3 3 3 2 88 st 3g 4 st 4 1 6sW CH NG ruc i

JADHAV TANMAY NITIN Question 29 A hinged support in beam can offer reaction in Horizontal direction and resistive moment in Vertical direction and resistive moment in horizontal direction and vertical direction in Horizontal direction and vertical direction along with recintivn

It is communicated through weak bosons Newton s law of gravitation The magnitude of gravitational force of attraction between two any point masses is mm given by F G Where G is universal gravitational constant G 6 67x10 Nm kg G is a scalar Dimensional formula is MT 2 mm

4 A B C and D Which of the following phenomenon is not commor to both sound and light waves 1 Interference 2 Diffraction 3 Reflection 4 Polarisation

35 USE CODE BAHUBALI FOR 10 OFF ON PLUS ICONIC SUBSCRIPTION The block A in figure weight 100 N The coefficient of static friction between the block and the table is 0 25 The weight of the block B is maximum for the system to be in equilibrium The value of T is 1 0 25 N 2 25 N 3 100 N 4 100 25 N T T T T 45 VT SIR

on between A and B is u the 23 If the coeff maximum acceleration of the wedge A for which B will remain at rest with respect to the wedge is a g c g F l OI B A 45 YA 9 d g

A point charge of 25 C is located in the XY plane at the point of position vector fo i 1 m What is the magnitude electric field at the point of position vector r 41 51 m B V m 900 9V m V m 90

690 nm Find the ratio of least separation between two points to be distinguished for same objective by microscope for light of wavelength 5000 A and electrons accelerated through 100 V used a illuminating substance 1 1250 3 2500 2 4075 erfe 4 1875

here I didn t understand last line how will current flow indefinitely without a voltage source i e potential difference Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature Even near absolute zero a real sample of a normal conductor shows some resistance In a superconductor the resistance drops abruptly to zero when the material is cooled below its critical temperature An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source Example Liquid Nitrogen

25 When current supplied by a cell to a circuit is 0 3 A its terminal potential difference is 0 9 V When the current supplied becomes 0 25 A its terminal potential difference becomes 1 0 V The internal resistance of the cell is 1 0 5 Q 2 22 3 1 2 Q 4 10 2

47 An ideal monoatomic gas is taken through the theromodynamic states A B C D via the paths shown in the figure If UA UB UC and Up represent the internal energy of the gas in states A B C and D respectively then which of the following is not true Mainipal 2012 DU a U UD Pressure 2p P D T Temperature B C 2T b UB UA

Choosing Copper as a target material will O a decrease the efficiency of the emitted X Ray O b has no effect on the efficiency of the emitted X Ray O c increase the efficiency of the emitted X Ray O d None

44 A uniform rod of mass m and length is suspended about its end Time period of small angular oscillations is 1 2 3 2 21 3g J m l 2 2 4 2 3g 47 A block having slightly oscillatic 1 2 2 3 2n 48 Two ma

53 Two identical thin rings each of radius R are coaxially placed at a distance R If the rings have a uniform mass distribution and each has masses 2m and 4m respectively then the work done in moving a mass m from centre of one ring to that of the other is 2Gm a zero b 1 2 R c Gm2 2 1 d Gm FR

63 Two identical thin rings each of radius R are coaxially placed at a distance R If the rings have a uniform mass distribution and each has masses 2m and 4m respectively then the work done in moving a mass m from centre of one ring to that of the other is 2Gm a zero b 1 2 R c Gm 2R 2 1 d 2 Gm 2R

Q No 46 EN View In English If two different non axial d orbitals having xz nodal plane form T bond by overlapping each other then internuclear axis will be Correct Answer 4 Your Answer 2 Status incorrect Right Answer 1 Your Answer 2 X Y Z Complete Question Content 7 They do not form n bond

of the square 7 a Electrostatic field line is a continuous curve that is no field line can break suddenly Why h Explain why two field lines never intersect each other 1 8 Two point charges q

Question No 7 A time varying magnetic field B t exists in a cylindrical region of radius R and is directed into the plane of the paper as shown X X OE X B X X Rx Which of the following graphs correctly depicts the relation between induced electric field E and r the distance of any given point P from the centre O

A stone of mass m is tied to a string of length at one end and by holding second end it is whirled into a horizontal circle then work done by tension when it covers half revolution will be O m 2 l O mg 2pl mv 0 0 l Marks 4 1

Consider a circuit with a constant current source of I 2mA with a capacitor of 2 F and resistor of 5k2 as shown in figure At t 0 the switch is closed I I denotes current in the capacitor resistor branch respectively and Ve represents potential difference across the capacitor Choose the correct graph s A C Al mA 2 0 0 t sec Al mA RAMAYEVA D 10 AV Volt 0 0 al mA 1 2mA 1 sec 2 F YATHE 1 Sk

2 5 Two particles are projected simultaneously from the level ground as shown figure They may collide after a time U 1 3 x sin 0 2 U X x sin 0 u sin 0 0 2 4 0 U x sin 0 U x sin 0 2 u sin 0 0

5 1 5 The voltage across a 12 pF capacitor is shown Compute the current waveform V t V 6420NY 0 2 6 8 dr 2 5 3 5 Find the value of capacitance C in the network shown to give a total capacitance of Ceq of 1 F t milliseconds 5 2 5 The voltage across a 3 mH inductor is 20 sin 377t 30 V Find the time varying part of the current through the inductor Ceq 1 F 2 F 2 F 5 F

There is a current of 20 mA passing through an ideal inductor when connected to a 100 V 20 Hz supply The power consumed is 1 W 25 W 39 W

The magnitude of TX Fis could be larger or smaller than the vectors always larger than could be equal to F F F F F F depending on the angle betwee

A block is at rest on an inclined plane making an angle a with the horizontal As the angle a of the incline is increased the block starts slipping when the angle of inclination becomes 0 Then coefficient of static friction is equal to 1 sine 2 cose 3 Jane Indonondent

Two rods of mass M and 2M having same length L are joined as shown in figure i Find MOI about given perpendicular axis about point O perpendicular to plain o paper 0 L 2 2M L L 2 M L

Calculate the ratio as shown in the following figure A O 314 O WIN NIC 02 R R R R w R www R R R B RAB RAC

For a substance the magnetic susceptibility at 25 C is 0 00021 The magnetic susceptibility at 35 C is 0 0023 0 00021 0 212 0 00041