Basic Physics Questions and Answers

3 10 A double convex lens of refractive index 2 of 30 cm Incident rays of light parallel to principal axis will come to converge at a distance from the lens is NCERT Pg 328 1 20 cm 3 15 cm has radii 2 10 cm 4 30 cm AT The colour which scattered most in atmosphere is 13 For ma real ob length 1 1 3 5 14 For a vi

4 a 2b 30 A moving coil galvanometer shows deflection of 100 divisions when 20mA current is passed through it If the resistance of the galvanometer coil is 500 find the voltage sensitivity of galvanometer 1 0 1 division mV 2 5 division mV 3 3 division mV 4 10 division my

A point object is moving with speed 8 cm s in front of a converging lens along the principle axis as shown in figure At this instant speed of image is NCERT Pg 328 1 32 cm s 2 34 cm s 3 20 cm s 10 cm s 8 cm s 30 cm f 20 cm

1 The magnetic field at point P is 3 Hol 4 2 a 1 Mal 8 2na O a 2 4 2 a 3 4 8 2na 2 Then around which loop linking both wireselgestioppaper A current carrying wire carries a current of 2A along the z axis which is out of the page while another wire carrying current of 4A in the same direction lies parallel to the first as shown in the figure B d will be zero 1 1 2 3 4 1 2 2 1 4 1 1 4 A square loop made of 4 identical conducting rods each of mass m and length I carry current i The loop is placed in a vertical position on a frictionless horizontal plane A uniform horizontal magnetic field B is in the plane of the loop then find the torque due to magnetic field on the loop at this instant 3 4 None of these Positive like charge of linear charge density A is passed on the outer circumference of an annular disc having outer radius 2R Negative like charge of 6 linear charge density A is passed on the inner circumference of the disc having inner radius R The disc is rotating with constant angular velocity about an axis passing through the centre of mass and perpendicular to its plane If the net magnetic field at the centre of the disc is 0 then the ratio en 0 2 i B 4 2i1 B A loop carrying current i lies in x y plane as shown in the figure The loop is made of 4 semicircular portions The magnetic moment of the current loop is 1 a ik 3 1 a k A homogeneous non conducting disc of radius R carries uniform surface charge density a The disc is rotating about an axis through its centre of mass and perpendicular to the plane with constant angular velocity The magnetic dipole moment is 1 B 2 21 TOR GR 2 2x 1 a ik 200 CHAND 2 A zaR 2 OR

5 A radioactive sample contains two nuclides A and B having decay constants from A How lo hr and 2 hr respectively Initially 25 of total decay comes from A How long hr will it take before 75 of the total decay comes from A Take In 3

The magnetic potential energy stored in a certain inductor is 25 mJ when the current in the inductor is 60 mA This inductor is of inductance NEET 2018 1 0 138 H 2 138 88 H 3 13 89 H 4 1 389 H

8 The peak emission from a black body at a certain temperature occurs at a wavelength of 6000A On increasing its temperature the total radiation emitted is increased to 16 times These radiations are allowed to fall on a metal surface Photoelectrons emitted by the peak radiation at higher temperature can be bought to rest by applying a potential equivalent to the excitation potential corresponding to the transition for the level n 4 to n 2 in the Bohr s hydrogen atom The work function of the metal is given by r eV where r is the numerical constant The value of r is found out to be ical cons 1 The value of r is found out to be 537 fi 53p find the 100 value of p Take he 12429 1

A rocket is launched from point A on earth It reaches point B on earth with its velocity antiparallel to its initial velocity The angle subtended by straight line joining AB at the centre is 20 0 60 If maximum height attained by the rocket is h km then is h 400 equal to Radius of earth R 6400 km G 20 B

frictionless floor When it is slightly disturbed the dumbbell begins to slide and the lower ball moves towards right At the instant when the upper ball leaves mass of each ball is m ards right At the instant when the R IIT CO SC Narayana IIT Academy disha if the lon 11 i the wall per ball leaves the wall 1800 419 1828 A dull mind gets bored easily A curious mind expands forever Page No 5 04 07 21 OSR IIT CO SC JEE Adv GTA 16 P 1 Q P A tension developed in the connecting rod is mg 3 7 B tension developed in the connecting rod is zero 3

2 A half litre bottle has a mass of 80g It contains 500 cm of liquid when full The bottle is filled with olive oil of density 0 90 g cm a Calculate the mass of oil in the bottle Calculate the mass of the full bottle b

There is a prism with refractive index equal to 2 and the refracting angle equal to 30 One of the refracting surfaces of the prism is polished A beam of monochromatic light will retrace its path if its angle in degree of incidence over the refracting surface of the prism is

A concave mirror forms on a screen an image of size twice that of the real object The mirror is kept stationary while the object and the screen are moved until an image of size thrice that of the object is formed on the screen If the screen displacement is 30 cm the focal length of the mirror is nearest to A 60 cm B 50 cm C 40 cm D 30 cm

charge density fixed horizontally A neutral and smooth ring Q of mass M can slide freely on the rod which happens to just fit in it and P is a non conducting particle having a mass m and charge q attached to the ring Q by means of a non conducting and inextensible string of length R P is released from the position shown in figure when the string becomes vertical SR IIT CO SC disha Narayana IIT Academy 1800 419 1828 A dull mind gets bored easily A curious mind expands forever A The speed of the particle P is v 71 2 m R q x 1 2 1 4 2gR M fv m 04 07 21 OSR IIT CO SC JEE Adv GTA 16 P 1 Q P 9 2fv r R B The tension in the string is T mg mv R Page No 6 In 1 m M C The loss in gravitational and electrostatic potential energy of the system appears as gain in its kinetic energy

In the following circuit the output Y for all possib inputs A and B is expressed by the truth table AC B 1 A 0 0 1 1 3 A 0 0 1 BY 0 0 1 1 0 1 1 1 BY 0 1 1 1 0 1 0 2 A BY 0 0 1 TT 1 4 A 0 0 1 1 0 0 1 0 0 0 1 1 BY 01 1 0 00 10

Athin uniform wire AB of length 1 m an unknown resistance X and a resistance of 12 02 are connected by thick conducting strips as shown in the figure A battery and galvanometer with a sliding jockey connected to it are also available Connections are to be made to measure the unknown resistance using the principle of Wheatstone bridge Answer the following questions 2002 5M the potential 2003 2M b Copy the figure in your answer book and show the battery and the galvanometer with jockey connected at appropriate c After appropriate connections are made it is found that no deflection takes place in the galvanometer when the sliding jockey touches the wire at a distance of 60 cm from 4 Obtain the value of the resistance X 20 Two resistor 400

Consider the following two statements Statement A A hot wire ammeter reads the RMS value of current Statement B A hot wire ammeter can read AC but cannot read DC The correct statement s is are Only A Only B Both A and B Neither A nor B

As an electron makes a transition from an excited state to the ground state of a hydrogen like atom ion O its kinetic energy increases but potential energy and total energy decrease O kinetic energy decreases potential energy increases but total energy remains same O kinetic energy potential energy and total energy decrease O kinetic energy and total energy decrease but potential energy increases

A cylindrical conductor AB of length 1 an area of cross section a is connected to battery having emf E and negligibl internal resistance The specifi conductivity of cylindrical conducto 1 varies as where o is constan and x is distance from end A The electri field just near the end B of cylinder 3E P 21 Value of p is B

6 A carnot engine having an efficient of as heat engine is used as a refrigerator If the work done on the system is 10 J th 1 10 amount of energy absorbed from the reservoir at lower temperature is c 100 J a 90 J b 99 J d 1 J

A uniform rod of mass m and length e is held horizontally by two vertical strings A and B of negligible mass and a small block of mass m is also placed on the top of the rod as shown in the figure Then which of the following is are correct A B C D 14 The tension in the string A immediately after the string B is cut is 7 B is cut is A 2 The tension in the string A immediately after the string B is cut is 5 7 mg The acceleration of centre of mass of the rod immediately after the string B is cut is 3 79 The acceleration of centre of mass of the rod and the block immediately after the string g mg B

A parallel beam of monochromatic light of wavelength 450 nm passes through a long slit of width 0 2 mm Find the angular divergence in which most of the light is diffracted in radian 4 5 x 10 3 2 25 10 3 2 10 3 1125 x 10 3

Two isolated charges q and 4q are separated by distance r They are performing uniform circular motion under their mutual electrostatic force alone What is their angular speed if the mass of each particle is m k 1 72

A uniform rod of mass m and length is held horizontally by two vertical strings A and B of negligible mass and a small block of mass m is also placed on the top of the rod as shown in the figure Then which of the following is are correct A B C D A 14 4 The tension in the string A immediately after the string B is cut is 7 mg mg 3 The tension in the string A immediately after the string B is cut is mg The acceleration of centre of mass of the rod immediately after the string B is cut is 3 g 7 The acceleration of centre of mass of the rod and the block immediately after the string 5 B is cut is 79

The graph between magnetic susceptibility and absolute temperature for a paramagnetic substance is Ellipse Circular Straight Line

In a series connection a resistor and an inductor are connected as shown in figure The value of inductance is L 0 03 H and resistance is R 0 15 kg The key K has been kept closed for a long time Then at t 0 K is opened and key K is closed simultaneously What will be the current in the circuit after 1 millisecond of opening K and closing K Take e 15 0 03 H 0000 K 0 15K ww

e Q No 6 Suppose we fill a glass flask with a liquid whose real expansivity is three times the linear expansivity of glass On heating 1 The liquid level will increase 2 The liquid level will decrease 4 Correct Answer 4 Your Answer 3 Status incorrect The liquid level will exactly remain same The liquid lovol will approximately remain samo 20 View

A transformer with a power efficiency of 80 converts a 10 V primary input voltage with a current of 10 A to a voltage of 20 V The current in the secondary coil will be 15 A 4 A 2 A

In the given figure system is in equilibrium Now the block of mass m is projected horizontal with initial velocity V Find the minimum value of such that one of blocks either A or B just loses contact with the ground M THIMER

If the refractive index of a material of equilateral prism is then angle of minimum deviation of the prism is 30 O 45 60 20 hr miny 75

The side of a copper cube is 1 m at 0 C What will be the change in its volume when it is heated to 100 C copper 18 10 C 3 A 45 x 10 m 3 B 54 x 10 m C 34 x 10 m D 64 x 10 m

The magnifying power of a telescope is 9 and the separation between the lenses is 20 cm for relaxed eye The focal length of component lenses fo and fe are respectively 2 cm 18 cm O 18 cm 2 cm 16 cm 4 cm 1 cm 16 cm

The focal length of a suitable convex lens is 30 cm and the size of image is quarter of the object Then object distance from lens is 150 cm 60 cm 30 cm hr miny 10 cm

An achromatic doublet is made up of two lenses of dispersive power w and 2w If the focal length of lens of dispersive power w is f then focal length of second lens will be 2f f 2 O f 2 2 f

A small block of mass m is fixed at upper end of a mass less vertical spring of 4mg L and natural 10L The lower end of spring is free and which constant K is at a vertical height L from fixed horizontal floor The spring is initially unstretched the spring block system is released from rest Till the block reaches its lowest position for the first time the duration for which spring is compressed is TL 41 o L sin ro find the value of x

3 An electron and a proton have the same De Broglie wavelength Then the kineitc energy of the electron is 1 zero 2 Infinity 3 Equal to kinetic energy of proton 4 Greater than the kinetic energy of proton

The angular speed of a propeller on a boat increases with constant acceleration from 11 rad s to 39 rad s in 3 0 revolutions What is the angular acceleration of the propeller 38 71 rad s s

A block of mass m sli incline of inclination 0 30 with constant speed through a distance s If coefficient of friction is u then work done by weight of the body is 1 3mgs mgs 2 umgs 4 4 mgs

White light is incident on the surface of glass and air as shown in figure If green light is just totally internally reflected then emerging ray in air contains Air White light Green Glass Yellow Orange Red Violet Indigo Blue O All colour

A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principle axis If the power of the original lens was 4 D then the power of each part of cut lens will be 2 D O 3D 4 D 5 D

A uniform bat time variable magnetic field B a bt applied in a cylindrical region of radius R a conducting rod PQ of length 2R is pivoted at P situated at distance 3R from centre of magnetic field As shown in fig at t 0 the rod start rotating clock wise with constant angular velocity the emf is induced in the rod due to the motion of rod in magnetic field is e Bo 3R 2 where B is T a b yo rod due to time variable magnetic field outside the cylindrical region Find the value of y ignore the effect of induced electric field on the XXX XXX xxx 2R

3 2 methyl 2 butene Which of the following does not form Grignard reagent on reaction with Mg in the presence of ether 1 Chloroethane 2 1 chloropropane 3 Bromobenzene 4 Vinyl chloride 1 phond chloropropane when treated with alcoholic KOH gives as major product

1 Kepler observed that Pluto orbits the sun in an elliptic motion With the sun at one focus nearest that Pluto gets to the Sun is 4 400 000 000 km and the farthest that it goes to the Sun is 7 400 000 000 km a Assuming that the center of Pluto s orbit is at 0 0 find the equation that models Pluto s orbit b If an unidentified planet is located in the other focus how far is this planet from the Sun

Eli attended a concert The decibel level of the music averaged 110 decibels but varied by 22 decibels from the average Write and solve an absolute value inequal to find the decibel range Graph the solutions

A soap bubble of radius r and wall thickness h is made in vacuum by blowing an ideal diatomic gas in it The surface tension of the soap solution is o and density of the soap solution is p Assume that the heat capacity of the soap film is much greater than that of the gas in the bubble Then choose the correct option s R ideal gas constant A B C D The molar heat capacity of the gas in the bubble is 4R The molar heat capacity of the gas in the bubble is 3R The time period of small radial oscillations of the soap film is 2 phr2 80 The time period of small radial oscillations of the soap film is 2 phr 40

An alkyl halide on reaction with sodium in the presence of ether gives 2 2 5 5 tetramethyl hexane The alkyl halide possibly is 1 1 chloropentane 2 1 chloro 2 2 dimethyl propane 3 3 chloro 2 2 dimethyl butane 4 2 chloro 2 methyl butane

Class Date Time 45 Min Q1 How many letters are there in English Q2 Write the capital letters of English language Q3 Write the small letters of English language Q4 Write the vowels of English language Q5 My name is Ramesh The underlined word is a b Noun a Pronoun c Verb Q6 Identify the silent letter in the word Knife Q7 Write the antonym for the followings 1 Day X 2 Increase X Q8 Add the suitable suffixes for the following words 1 Use 2 Agree Q9 Fill in the blank with suitable countables uncountables I drink d Adverb when I am thirsty water stone star Q10 Fill in the blank with suitable verb form He Q11 Write the past tense for the following 1 Come visit temple every Sunday 2 Go Q12 Fill in the blank with suitable interrogative word who what when is your English teacher Q13 Fill in the blanks with suitable prepositions in into on 1 Sindhanur is Raichur district the room 2 The teacher entered Q14 The rhyming word for Way is a seen b gay c pin Q15 Write the plural form of the word Bag 016 Rearrange the words in a meaningful sentence d man

impulsiv 4 Assertion The apparent weight of a body in an elevator moving with some downward acceleration is less than the actual weight of a body Reason The part of the weight is spent in producing downward acceleration when body is AIIMS 2010 in dlounter

Three observers A B and C are listening to a moving source of sound The diagram below shows the location of the wavecrests of the moving source with respect to the three stationary observers Which of the following is true A B A The wavefronts move faster at C than at A and B B The frequency of the sound is highest at A C The frequency of the sound is highest at B D The frequency of the sound is highest at C C

1 The specific conductivity of standard BaSO4 solution is 3 06 x 10 6 ohm 1 cm 1 and that of water is 6 0 x 10 8 ohm 1 cm 1 If BaSO4 is approximately 150 0 ohm eq cm2 the Ksp BaSO4 will be 1 4 0 x 10 12 3 2 5 10 13 2 2 5 10 4 4 0x 10 10 3 To Telegram neetquestion pap

density p The rod is placed on horizontal bottom of a large tub and then water is gradually poured in the tub Density of water is po Q 12 5 and P2 Po Then find the depth of water in the tub when rod If P Po a makes 0 53 with horizontal A 75 cm B 80 cm