Basic Physics Questions and Answers

The diagrams below show regions of equipotentials 20V 40V 20V 40V 10V 30V HUD B A B A B A 10V 30V a 10V 30V b 20V 40V c 20V 40V 10V 30V B d A positive charge is moved from A to B in each diagram 1 In all the four cases the work done is the same 2 Minimum work is required to move q in figure a 3 Maximum work is required to move q in figure b 4 Maximum work is required to move q in figure c

According to Faraday s law of electromagnetic induction the total charge flown through a cross section of a conducting loop depends upon Initial magnetic flux only Final magnetic flux only O Rate of change of magnetic flux ONet change in magnetic flux

ven V VI I 22 Use source transformation to obtain Circuit B so that it is equivalent to Circuit A Determine V in Circuit B Circuit A Circuit B 03 V 2 3 A 1 3 V 30 30 www R V 10 2 ww Vz 10 2 V 5 A 1 R V 50 5 V Vz 50 ww Vx 29V V1 6V R1 6 ohm R2 2 5 ohm

If the rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same then which among the following is most suitable option A Equal masses of the liquids at the same temperature are taken B Equal volumes of the liquids at the same temperature are taken D Both 1 and 2 Insufficient information

A sound source emitting sound of frequency 450 Hz is approaching a stationary observer with velocity 30 m s and another identical source is going away from the observer with the same velocity If the velocity of sound is 330 m s 1 then the difference of frequencies heard by observer is A B D 103 5 Hz 82 5 Hz 33 5 Hz 92 5 Hz

27 If the radius of the Al nucleus is estimated to be 13 3 6 Fermi then the radius of 125 Te nucleus be nearly A B 6 Fermi D 8 Fermi C 4 Fermi 5 Fermi

3 How many seconds are there in a leap year Express it in standard form 4 If the velocity of light is 3 0 108 metres per second calculate the distance travelled by light in a light year and express it in standard form Hint One light year Distance travelled by light in a year

Boyle s law states that the volume of a gas is inversely proportional to the pressure if the temperature is held constant A gas has a volume of 170 6 mL when the pressure is 1 31 atm What is the volume in mL to one decimal place if the temperature remains constant and the pressure is increased to 5 96 atm Your Answer

A body is projected at 30 with velocity v from point A on the ground At the same time another body is projected vertically upwards from B with velocity v2 from the ground The point B lies vertically below the highest point of the trajectory of ball A For both the bodies to collide what should be the ratio of 1 V2 A 1 B 2 C N N D 2

The figure shows currents in a part of electrical circuit then current is 2 A 2 A O 1 7 A 1 7 A Read More O 2 3 A 1 A 1 3 A

26 NTA Test 23 Single Choice md The main scale of a vernier calliper reads 10 mm in 10 divisions 10 divisions of vernier scale coincide with 9 divisions of the main scale W he two jaws of the callipers touch each other the fifth division of the vernier coincides with a main scale division and the zero of the vernier he right of zero of the main scale When a cylinder is tightly placed between the two jaws the zero of vernier scale lies slightly to the left of 2 cm and the fourth vernier division coincides with a main scale division The diameter of the cylinder is thon to

Calculate the depth below the surface of sea that a rubber ball should be taken so as to decrease its volume by 0 1 density of sea water 1000 kg m 3 Bulk modulus of rubber 9 108 N m 2 acceleration due to gravity 10 m s 1 9 m 3 180 m 2 18 m 4 90 m

Two liquid of densities d d and viscosities 1 and 1 are found to flow through a capillary tube under a constant pressure head at the same mass rate Then the ratio 1 1 d 1 dz d 2 di 3 independent of d d 4 None of thogr

From the following facts i 2X Y 2Y X2 ii 2W Y No reaction iii 2Z X 2X Z Which of the following is true Only one correct answer A B i Ew w Ey Y Ex2 x E Ewa W Ey Y Ez Z E

ALLEN In the circuit if no current flows through the 8 galvanometer when the key K is closed the bridge is balanced The balancing condition for bridge is R R ww 2 4 utu utu R Dipole is placed parallel to the electric field If W 9 w shefe einer enter and a gifera starten the fer fra starten st R R R faga a fagan HAR EN fe fee

19 In one experiment of determination of speed of sound in air student records 3 readings as given in table find percentage error in reading 1 330 5 m s 331 0 m s 328 5 m s 0 5 330 5 Reading 1 Reading 2 Reading 3 0 5 100 330 a b 100

PLS PROVIDE STEP WISE SOLUTION WITH REASON Provide ALL Alternative approaches and solutions to the Q A point particle is acted upon by a restoring force kx The time period of oscillation is T when the amplitude is A The time period for an amplitude 2A will be A T B T 2 C 2T D 4T

59 A body Potential has equation a V x y xy Find its kind of Motion after Releasing it from Rest from 1 2 1 2 A Const Acc q m B Circular Motion with Acc q m C Const Retardation of q m mais AT X with Ace of alm

A particle has the wave function y x t A exp iwt cos kx Which one of the following is correct a This is an eigenstate of both energy and momentum b This is an eigenstate of momentum and not energy c This is an eigenstate of energy and not momentum d This is not an eigenstate of energy of momentum

A current flows in a long straight wire with cross section having the form of a thin quarter ring of radius R see figure The magnetic field B at point O if the current flows out of the page is L 1 Hol R R 1 1 3 i 1 Hol T 2R 2 1 Mol T R 4 Hol T R 1 1

llic bob of mass m and charge Q is in equilibrium in the presence of electric repulsion by a fixed charge Q as shown in the figure Find the value of Q In 1 2 mg L 1 3 8 mg L 1 1 1 1 Q 60 L 2 4 mg L 4 None of these

In the path of a beam converging towards a point on screen a glass plate of thickness tis placed The convergence point will shift by refractive index of material of slab Only one correct answer A t B t c t 2 1 20 C

At 1 0 a radioactive substance has a mass m Its half life is 10 minutes When 1 1 the amount substance disintegrated is m 5 and when t 12 the amount of substance disintegrated is 3m 5 Then the time interval 1 1 is 1 10 minutes 2 20 minutes 3 5 minutes 4 7 minutes

Two coaxial dipoles of dipole moments p and p are separated by a distance r The magnitude of electric force on p due to p is k 1 3 2kp P 7 3 6kp P 4 4 none of these r 4 2 2kp p j 4 zero arn

A disc is given an initial angular velocity wo and is placed on rough horizontal surface as shown The quantities which will not depend on the co efficient of friction is are Question Type Multiple Correct Type 1 2 3 0 4 The time until pure rolling begins The displacement of the disc until pure rolling begins The velocity when pure rolling begins The work done by the force of frictic

3 A uniform rectangular plate has been bent as shown in the figure The two angled parts of the plate are of identical size The moment of inertia of the bent plate about axis xx is I Find its moment of inertia about an axis parallel to xx and passing through the centre of mass of the plate D E 60 B C b

31 For the reaction N 05 g 2NO2 O2 the rate of 2 g g 1 S disappearance of N O5 is 6 25 x 10 mol L s The rate of formation of NO2 and O2 will be respectively AIPMT 2010 a 6 25 x 10 3 mol L s and 6 25 x 10 mol L s S b 1 25x10 2 mol L s and 3 125 x 10 3 mol L s 1 S 1 S c 6 25 x 10 3 mol Ls and 3 125 x 103 mol L s d 1 25x10 2 mol Ls and 6 25 x 10 mol L s

The two vectors A and B that are parallel to each other are 1 3 6 9k 2 3 6 9k 3 2 6 9k 4 A 21 31 3k B 2 3k B 1 2 3k B 2 3k B i 21 3k

1 50 W 3 200 14 4 400 W 22 A capacitor of capacitance 1 F is charged to a potential of 1 V It is connected in parallel to an inductor of inductance 10 3 H The maximum current that will flow in the circuit has the value 1000 mA X 1 A 4 1000 mA ancillating L C circuit the maximum charge on the capacitor is Q The charge on the capacitor wh the electric and magnetic field is 1 3 on 2 1 mA

An electric dipole consist of two opposite 18 charges each of magnitude 1 C separated by a distance of 2 cm The dipole is placed in an external field of 10 N C The maximum torque that could act on dipole is 1 0 5 102 N m 2 1 102 N m 3 2 102 N m 4 3 10 N m gaya fake fa faa 1 C 2cm af 10 N C 7 X HUBJT I5I THU A B C D I 1 0 5 102 N m 2 1 102 N m 3 2 10 N m 3 x 10 N m ionpaper

If temperature is increased from 27 C to 127 C what is ratio of de Broglie wavelength of wave associated with a material particle at these two temperature 1 155 1 92 2 665

A solid cylindrical aluminum conductor 25 km long has an area of 336 400 circular mils Obtain the DC conductor resistance at a 20 C and b 50 C The resistivity of aluminum at 20 C is 2 8 x 10 8 Q m and T 228 L 25 x10 m2 P 2 8x1082L m

The energy difference between first excited state and ground state of a given system is 1 96 eV The transition occurs between first excited state and ground state Given K 8 6 X 10 5 eV K or 1 38 X 10 power 23 J K The ratio of poulation of excited versus ground state at 27 degree celsius is OPTIONS 0 326x10 31 0 56 10 31 1 1 10 33

The scale of a galvanometer is divided into 150 equal divisions The galvanometer has the current sensitivity of 10 divisions per mA and voltage sensitivity of 2 5 divisions per mV Find value of Shunt S to be connected to convert into Ammeter of range 0 6 A Only one correct answer A 0 10 2 B 0 04 0 C D 16 Q 0 01 Q

The maximum and minimum magnitudes of resultant of two vectors are 12 units and 6 u respectively Then the magnitudes of two vectors will be A 8 units 4 units B 10 units 4 units C 9 units 3 units D 7 units 5 units

32 During 2A B Run the kinetic study of the reaction C D following results were obtained 4 in M B in M Initial rate of formation of 1 D in Ms S I 0 1 0 1 II 0 3 0 2 III 0 3 0 4 IV 0 4 0 1 On the basis of above data which one is correct 6 0 10 7 2 10 2 88 10 2 40 10

A uniform stick of mass 18 kg and length 3 m spins around on a frictionless horizontal plane with its Centre of Mass stationary A mass M is placed on the plane and the stick collides elastically with it as shown with the contact point being the end of the stick What should M in kg be so that after the collision the stick has translational motion but no rotational motion l M

30 A dip circle is taken to geomagnetic equator The needle is allowed to move in vertical plane perpendicular to magnetic meridian The needle will stay In horizontal plane only 2 In vertical direction only 3 In any direction except vertical 4 In any direction it is released component dieulor of externa

Illustration 3 117 Consider an ellipse having its foci at A z and B 2 in the Argand plane If the eccentricity of the ellipse be e and it is known that origin is an interior point of the ellipse then prove that 131 3 1

3 3 4 4 12 1 The escape velocity on a planet with radius 41 double that of earth and mean density equal to that of earth will be escape velocity on earth 11 2 km sec 1 11 2 km sec 3 5 5 km sec 2 22 4 km sec 4 15 5 km sec 3 3 4 4 12 1 e fu fatal geat of front of gr arier am af at a yell 11 2 km sec 1 11 2 km sec 3 5 5 km sec 2 22 4 km sec 4 15 5 km sec

Match the following Mixture of chalk and water Mixture of sand and water Mixture of iron filings salt and sand Husk and paddy Magnetic separation Decantation Filtration Hand picking

SSAGE aser system is capable of Ex 10 Sev K or 1 38 x 10 lasing at several infrared wavelengths where the most prominent wavelength is 3 1235 mm Given k power 23 J K The relative population of these states at 27 degree Cis OPTIONS 0 23 0 56 0 75

A positive charge particle having charge q enters a region where magnetic flux density is Bo with speed vo as shown in the figure The time after which it will come out of the field is symbols have their usual meanings X X XK 6 X X X X X X X X X X X X X X X X X Bo X X X X X X X X X X X X X X

4 The formula for centrepetal acceleration in a circular motion is u an d 2 1 3 x v 4

49 A body is performing simple harmonic motion with amplitude a and time period T Variation of its acceleration f with time t is shown in figure If at time t velocity of the body is v which of the following graphs is correct a Taxat A fada fa TRI 1 T 4 TTT 24 T 4 3T A T T 4 2 2 T 2 T 4 3 T t TT 4 4 T in 2 T 4

1 S 2 S 3 S For the given diagram find the gravitational 37 potential at the centre of the square is m m Gm a 1 2 2 Gm a 3 4 m a 2 m 4 Telefran Gm 4 2 a Gm 4 2 3 1 S 2 S 3 S fact T fast af kunft gecata fava m Gm 1 2 2m a 3 m Gm a a a m m 4 SA Gm a Gm a 2 4 2 4 2 3

5 In the circuit shown in figure ter 25 and voltmeter are ideal If E 4V R and r 102 then readings of ammeter and voltmeter are 1 1A 3V 3 3A 4V R 2 2A 3V 4 4A 4V quest ffatter of E 4V R atceteriri E r 1 1A 3V 3 3A 4V S R 2 2A 3V 4 4A 4V fer

PASSAGE A glass clad fiber is made with core glass of refractive index 1 4 and the cladding is doped to give a fractional refractive index difference of 0 004 Choose the correct options Marks 1 The refractive index of cladding will be OPTIONS 1

2 3 A body moves in a straight line along x axis Its distance x in metre from the origin is given by x 8t 31 The average speed in the interval t 0 to t 1 second is 1 5 ms 1 2 4 ms 3 6 ms 1 4 zero

5 A rectangular coil has 60 turns and its length and width is 20 cm and 10 cm recpectively The coil rotates at a speed of 1800 rotation per minute in a uniform magnetic field of 0 5 T about its one of the diameter The maximum induced emf will be Uch dich us 60 Jul af fa al ad all 1 60 V 2 220 V 20 310 40 5 1800 ufa fuae ant alcd fi fhu 414 fa quia s c t 3 113 V 4 330 V