Basic Physics Questions and Answers

Space between two concentric conducting spheres of radii a and b b a is filled with a medium of resistivity p the resistance between the two spheres will be A B C D 1 1 a b 27 1 1 a b P 1 1 47 a b 2 1 4 2 a

Fig 9 1 shows a bookshelf with two groups of books A and B on it There are six books in each group of books All the books are identical The mass of each book is 0 52 kg 1 3 cm shelf 30 cm 21 cm group A of books 21 cm Fig 9 1 30 cm group B of books 1 3 cm i Explain why the pressure exerted on the shelf by the books in group B is less than the pressure exerted on the shelf by the books in group A

A metal rod of length L 1 m is hinged in vertical plane and it can rotate freely about point O as shown If rod is released from the horizontal position then maximum electric field inside the rod in S I unit comes out to be K 30 find the value of K Assume mass of electron is negligible B XB 2 2 Tesla

Two uniform rods each of mass m 1 kg and length I 1 m are hinged at B and pivoted at C If a horizontal impulse FAt 7 N s is applied to the end A of the lower rod then find the angular velocity w2 in rad sec of the upper rod just after the impulse At is very small and rods can rotate freely w r t hinge and pivots FAt 1 m B 1 m

For a projectile motion in x y plane on some planet the position co ordinates as a function of time t are given as x At and y At 6t where x y are in metre and time t is in second Assume x is horizontal and y is vertical The horizontal range of the projectile is 3 1 m 2 6m 3 8 co 00 B 3 16 m 3

16 Consider the diagrams shown Work done in transferring wire from position 1 to position 2 is W Work done in transferring the wire from position 3 to position 4 is W then i Position 3 W A W C W W 0 Position 1 Fixed Position 2 Fixed Position 4 W221 B W D W is positive W is zero

A person of height h is standing in front of a plane mirror a What is the minimum size of the mirror so that complete image of the person is formed b What is the minimum size of the mirror so that the person can see his complete image c Where should the top edge of the mirror be placed relative to the eyes and the head of the per that the person sees his complete image

28 The resultant of A and B makes an angle a with A and B with B with then 20 A a B C a ifA B B a ifA B D a ifA B The minimum number of coploper roots D 180 0 2490 28 Aukell alta Ai By 1 a B 3 a B MA B 2 a BA B 4 a B A B

33 D 7 N Fnet 17 N Two vectors A and B are such that A B C and A2 B2 C 2 Which of the following statements is correct A A is parallel to B B A is anti parallel to B C A is perpendicular to B D A and B are equal in magnitude 33 D 7 N Fa net S 17 N AB C dl flaniel sy aun my A AB B Anime C AB ID B YOU HAY U 2 A B CA B

Arked zivotu If in the relation y Ac It is in second find the dimension of B A LT B LT C L D T cy is in meter 8 Target Pre Medical 2022 07 06 2 y 22 s t ajoitty Ac 4 Bjud i A LT B LT C L D T

m s left d 40 cm s ts moving with a ion It is observed velocity is 6 cm s ight of height h n wards from the Show th 1 30 In a village Shyam bats for hitting two points A and B on a staircase with his goli from the position P shown in figure 1 158 Find the velocities required for P to hit A and B 1 2 m 2 1 m Ans 4 65 m s 10 6 m s A 0 35 m 0 35 m 1 I T0 2 m Figure 1 158 1 0 2 m 0 9 m 10 2 m 2 m B

7 There are two force vectors one of 5N and other of 12N at what angle the two vectors be added to get resultant vector of 17N 7N and 13N respectively A 0 180 and 90 B 0 90 and 180 C 0 90 and 90 D 180 0 and 90 27 I sell 13N 40 SN 12N clas 17 7 A 0 180 24 90 B 0 90 C 0 90 180 90

Q No 20 Measuring instrument which conforms to all the specified statutory provisions is called A Ordinary measuring instrument B Measuring instrument acceptable for verification C Auxiliary measuring instrument D Legal measuring instrument

A step down transformer is connected to 2400 volt line and 80 amperes of current is found to flow in output load The ratio of the turns in primary and secondary coil is 20 1 If transformer efficiency is 100 then the current flowing in primary coil will be A 1600 A C 4 A B D 20 A 1 5 A

A particle having charge q and mas m is projected with velocity 4i 6j 3k m sec from the origin in a region occupied by electric field E and magnetic field B such that Bai and E Ei take qEo 2 Find the time in sec when the magnitude of velocity of the charge particle becomes 5 5 sec neglect the gravity

a A force of magnitude P 8 kN is acting at A as shown What are its components along b band c c ii Transfer the force at A to pointB Take each grid as a square of size P cm P 8 A B

30 In Figure E D equals A A B A C B D B in 16 Tul 30 uni you E D C1412 A A B A C B 31 D B 14 ANE A RUBRua PedF 2 Gazil

one of the most fundamental pieces when learning how A Multumiter B Powr supply C Ground D Breadboard ar gode for 22 9 resistor with 20 tolerance

Two parallel long wires carry currents i and i with i i When the current are in the same direction the magnetic field at a point midway between the wire is 20 T If the direction of i is reversed the field become 30 T The ratio i i is 1 4 3 5 2 3 4 1

Which of these is true about regression analysis The resulting S square statistic shows how well the line fits the data points OIt is sometimes referred to as the line of best fit O It is based on two data points O It is theoretically less sound than the high low method All of the above

An ideal cell of 35 V and a cell of 20 V having internal resistance 4 ohms are connected in parallel to each other between points A and B the equivalent emf between A and B is A 20 V B C D 27 5 V 12 5 V 35 V

Two resistances of 4000 and 80022 are connected in series with a 6 volt battery of negligible internal resistance A voltmeter of resistance 10 000 is used to measure the potential difference across 4000 The error in the measurement of the potential difference in volts approximately is A 0 01 B 0 03 C 0 02 D 0 05

A cylinder is wrapped around its lateral surface by a rope as shown in the figure The rope is moved upwards such that cylinder does not fall from its initial position Initially it was at rest What is the acceleration of the rope mgv g 2g 3g

The coefficient of self inductance of a solenoid is 0 18 mH If a core of soft iron of relative permeability 900 is inserted then the coefficient of self inductance will become nearly 5 4 mH A C 162 mH 0 0002 mH 0 006 mH Magnetic Field B D

51 If X Y Z wearing dimensions L T 1 M L T2 M L T and numerical values 3 3 x 10 666 10 0 666 10 29 respectively in C G S system are chosen as fundamental units find the new unit of mass Ans 1 8 x 10 5 unit of mass

A radioactive nuclide A with decay constant transform into a radioactive nuclide A with decay constant 2 Assuming that at the initial moment the preparation contained only the nuclide A then the time interval after which the activity of the nuclide A reach its maximum value is In 2 2 22 2 3 In 22 2 1 2 In 2 22 2 22 4 e 21 2

Catalyst Package for NEET 29 An object is oscillating about certain mean position Its time period of oscillation is being measured by a stop watch of least count 0 1 s For 20 oscillations the time noted down is 40 0 s Then fractional error in measurement of time period of oscillation is tdgi 1 3 1 20 1 200 1 400 1 4 40 the main scale divisions is 1mm 2

Example 25 2 Radius of a spherical conductor is 2 m This is kept in a dielectric medium of dielectric constant 106 N C Find a capacitance of the conductor b maximum charge which can be stored on this conductor

2 59 1 The light intensity gets reduced with no change in its colour produces bright white light As the batteries wear out 2 Light colour changes first to yellow and then red with no change in intensity 3 It stops working suddenly while giving white light 4 Colour changes to red and also intensity gets reduced

38 What is equivalent capacitance of circuit between points A and B bas sobiran 58 rit sagims t 1 F 3 F 9 F 27 F HH HH TH is coll 20 tums 1 F 1uF A 1 F 1uF H 1uF 2 3 HH 3uF a UF HHH 9 F 27 F HH Infinite section garwollor 6 UF 3 P B

5 According to Joule s law of heating heat produced H 1 Rt where I is current R is resistance and t is time If the errors in the measurement of I R and t are 3 4 and 6 then percentage error is the of H is respectively measurement A 17 C 19 B 16 D 25 36

4 A dimensionally incorrect equation is incorret The density of mercury is 13600 kg m Its value in CGS system will be 1 13 6 g cm 3 3 136 g cm 3 2 1360 g cm 3 4 1 36 g cm 3

3 The distance covered by a particle in time t is given by x a bt ct2 dt The dimensions of a and d are 1 L T 3 3 L T3 2 L LT 3 4 none of these

Two resistance wires A and B of same material are connected in series It is given that Lengths of resistance wires are 21 1 1 Areas of resistance wires are A A A A Temperature coefficients of resistance wire a a and a 2a When resistance wires are connected in series then temperature coefficient of composite conductor is Na Find the value of N

A frictionless track ABCDE ends in a circular loop of diameter x A body slides down the track from point A which is at a height h 4 cm Maximum value of x to complete the loop successfully is 8 1 cm 2 2 cm 20 3 cm 3 h A E D X B C 484

A piece of ice falls from a height h so that it melts completely Only one quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall The value of h is Latent heat of ice is 3 4 x 105 J kg and g 10 N kg Phase I 2016 A 136 km 68 km C 34 km 544 km B D

Q39 Find the result of mixing 10 g of ice at 10 C with 10 g of water at 10 Lice 80 Cal g Cw 1 Cal g C Cice 0 5 Cal g C a 6 25 g ice will melt Temperature will remain 0 0 625 g ice will melt Temperature will increase to 10 c 6 25 g ice will melt Temperature will increase to 10 0 625 g ice will melt Temperature will remain to 0 C

27 A body travels uniformly a distance of 16 0 0 2 m in a time 4 0 0 03 s The velocity of the body within error limits is A 4 0 08 ms 1 B 4 0 8 ms 1 C 4 0 23 ms 1 D 12 0 23 ms 33

A body tied to a string vertical circle with minimum velocity when the reaches the upper most point the string breaks and the body moves under the influence of the gravitational field of earth along a parabolic path The horizontal range AC of the body will be 1 x L 2 x 2L 3 x 2 2L 4 x 2L m L 0 A X C

1 0 1 N 2 IN 3 10 N 4 100 N 1 According to Newton the viscous force acting between liquid layers of area A and velocity Av gradient Av Ax is given by F 1A Ax where is constant called coefficient of viscosity The dimensional formula of 1 is 1 ML T 3 ML T 2 M LT 4 MLT

ch the Matrix A person in a lift is holding a water jar which has a small hole at the lower end of its side When the lift is at rest the water jet coming out of the hole hits the floor of the lift at a distance d of 1 2 m from the person In the following state of the lift s motion is given in List I and the distance where the water jet hits the floor of the lift is given in List II Match the statements from List I with 2014 those in List II and select the correct answer using the code given below the lists List I List II P Q R Lift is accelerating vertically up Lift is accelerating vertically down with an acceleration less than the gravitational acceleration Lift is moving vertically up with constant speed Lift is falling freely S Code A P 2 Q 3 R 2 S 4 C P 1 Q 1 R 1 S 4 1 2 d 1 2 m d 1 2 m 3 d 1 2 m 4 No water leaks out of the jar B P 2 Q 3 R 1 S 4 D P 2 Q 3 R 1 S 1

1X4 4 I Attempt any four sub parts each question carries 1 mark 5 Carnot engine is an ideal heat engine which converts heat energy into mechanical energy Efficiency of Carnot engine is given by n 1 T T Where T is the temperature of source and T is temperature of sink If Q is the amount of heat absorbed cycle from source Q is the amount of heat rejected cycle to the sink and W is the amount of useful work done cycle then W Q Q and Q Q T T With the help of the passage given above choose the most appropriate alternative for each of the following questions A Carnot engine absorbs 6x10 cal At 227 C Heat rejected to the sink at 127 C is a 6x 10 cal b 4 8x10 cal c 4x 105 cal d 5x105 cal

Q2 An angle modulated signal with a sinusoidal carrier 100 cos 2n fet and a sinusoidal message with frequency f 20 Hz knowing that B 0 7 a Draw the single sided spectrum b Determine the modulated signal bandwidth c Determine the 70 and 90 bandwidth and transmitted power

A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm The torque required to stop after 2 revolutions is NEET 2019 A 2 x 10 6 Nm B 2 10 Nm C 12 10 4 Nm D 2 x 106 Nm

A thin uniform wire AB of length 1 m and an unknown resistance R and a resistance of 12 2 are connected by thick conducting strips as shown in figure A R m B C 12 2 D A battery a galvanometer and a jockey are connected to the above arrangement and it is found that galvanometer s null deflection point is at a distance of 60 cm from A Find the value of unknown resistance R

force 40 A spring has a natural length of 50 cm and a f constant of 2x10 Nm A body of mass 10 kg is suspended from it and the spring is stretched If the released it executes simple harmonic motion What body is pulled down to a length of 58 cm and is the net force on the body when it is at its lowermost position of its oscillation Take s g 10 ms a 20 N70 b 40 N 45 T f c 60 N d 80 N of 3 kg and 6 kg are attached

5 Find the maximum possible percentage error in the calculation of force on an object of mass m travelling with velocity v in a circle of radius r if m 4 0 0 1 kg v 10 0 1 m s and r 8 0 0 2 m ons 1 5 2 8 3 4 4 7 0 y ad liv

Knowledge Sections Q No 28 If attempts are made to make an instrument very sensitive which of the following qualities is likely to be impaired A Precision B Accuracy C Readability D Rangeability 2

A conductor of mass m and length is placed horizontally perpendicular to perpendicular to a uniform horizontal magnetic field B Suddenly a certain amount of charge is passed through it so that it jumped to height h The amount of charge that passes through the conductor is

Q No 39 Knowledge Sections The purpose of ratchet screw in micrometer screw gauge is A To lock a dimension B To impart blow motion C To maintain sufficient and uniform measuring pressure D To take care of wear of screw threads