Basic Physics Questions and Answers

Electromagnetic waves of wavelength 500 nm are incident on a YDSE apparatus Both slits are o same width Here d 3 mm D 2 m Intensity at central maxima is 1 W mr what is the intensity in W m at a point 1mm above maxima of order 1

A steel scale measures the length of a copper wire as 80 0 cm when both are at 20 C the calibration temperature for scale What would be the scale read for the length of the wire when both are at 40 C Given asted 11x10 6 per C and acopper 17x10 6 per C a 80 0096 cm b 80 0272 cm c 1cm d 25 2 cm

94 A solid cube of wood of side 2a and mass M is resting on a horizontal surface as shown in the figure The cube is free to rotate about a fixed axis AB A bullet of mass m M and speed v is shot horizontally at the face opposite to ABCD at a height 4a 3 from the surface to impart the cube an angular speed It strike the face and embeds in the cube Then o is close to note the moment of inertia of the cube about an axis perpendicular to the face and passing through the center of mass is 2Ma 3 a Mv ma D A B b Mv 2ma

A system of men and trolley is shown in Fig 9 89 To the left end of the string a trolley of mass M is connected on which a man of mass m is standing To the right end of the string another trolley of mass m is connected which a man of mass M is standing Initially the system is at rest All of a sud den both the men leap upwards simultaneously with the same velocity v with respect to ground a b d FIG 9 89 Linked comprehension 4 6 4 Find the relative velocity of left man with respect to his trolley just after he leaps upwards b my m M d My m M 2mv m M 2 Mv m M Mmv m M 5 Find the impulse generated in the string connecting the trolleys during this process a M m v m M M m v m M m M v m M M m

14 Fluid flow in a straight circular pipe is typically turbulent in nature when the Reynolds number Re is chi o Batairs treat a fafti a 2000 Re 4000 b R 2000 c Re 4000 CLASS

98 The figure of a centimeter scale below shows a particular position of the vernier calipers In this position the value of x shown in the figure is figure is not to scale 3 Main Scale Vernier Scale a 0 02 cm b 3 65 cm c 4 15 cm d 0 03 cm 11 4 10 5

Two spheres have radii 10 cm 20 cm One of the sphere is given 150 C charge and connected by a wire Their common potential will be a 9 106 volts c 1 8 x 106 volts b 4 5 x 106 volts d 1 35 x 10 volts

14 The absolute temperature of air in a region linearly increases from T to T in a space of width d Find the time taken by a sound wave to go through the region in terms of T T2 d and the speed v of sound at 273 K Evaluate this time for T 280 K T 310 K d 33 m 2 1 300

The resistive force acting on a body moving with a velocity V through a fluid at rest is given by D F C V Ap where C coefficient of drag A area of cross section perpendicular to the di rection of motion and p density The dimen sions of CD are A ML T 2 C M L T 2 B M L 172 D MOLOTO

Current I decreasing at a steady rate I In the above situation the direction of induced current in the circular coil wil a Clock wise when viewed from top b Anticlock wise when viewed from top c Initially clock wise and then anticlockwise when viewed from top d No induced current is set up in the coil

Therefore Cl 07 is an acidic oxide chloric acid NCERT EXERCISES 3 1 What is the basic theme of organisation in the periodic table The begin

ere t 3 92 One mole of an ideal monatomic gas undergoes the following four reversible processes Step1 It is first compressed adiabatically from volume V to 1m Step 2 then expanded isothermally to volume 10 m Step 3 then expanded adiabatically to volume 3 Step 4 then compressed isothermally to volume V If the efficiency of the above cycle is 3 4 then V is 1 a 2m c 6 mi b 4m

I found the answer value but the direction is not clear to me Please help me to find out the direction 37 Two cars are moving with speeds 9 ms and 15 ms The relative velocity of first car w r t second car if the first car is moving along North and second car is moving along West is a 3 34 ms at tan 5 3 3 b 34 ms at tan c 8 ms at tan d 2 2 ms 1 at tan REDMI NOTE O North to West North to East North to East North to Westvennane Asked by 1568073 aesl id Standard XII Stream NEET Jul 14 2021 5 29 F Add your responses Type Text Type your answer here OR you can upload an attachment from the option below

What would be the time period and amplitude of the sh m A square rigid superconducting loop of mass m and side a lies in a horizontal plane in a non uniform magnetic field given by Bx xx By 0 B az Bo The inductance of the loop is L At the initial moment the loop s centre coincides with origin O and its sides parallel to the x and y axis the current in the loop is zero and it is released Then loop will start SHM Asked by 380558 aesl id Standard XII Stream JEE Jul 14 2021 at 6 07 DM

99 A parallel beam of light is incident on a tank filled with water up to a height of 61 5 mm as shown in the figure below Ultrasonic waves of frequency 0 5 MHz are sent along the length of the water column using a transducer placed at the top and they form longitudinal standing waves in the water Which of the schematic plots below best describes the intensity distribution of the light as seen on the screen Take the speed of sound in water to be 1 500 m s a 300 m ovim Z www 6 15 cm b SCREEN V Z 16

Q 50 A free electron and aproton are placed between two oppositely charged parallel plates Both are closer to the positive plate than the negative plate e e Which of the following statements is true i The force on the proton is greater than the force on the electron ii The potential energy of the proton is greater than that of the electron iii The potential energy of the proton and the electron is the same a Only i b Only ii c Only iii and i

GR0065 66 A planet is revolving round the sun Its distance from the sun at Apogee is r and that at Perigee is r The mass of planet and sun is m and M respectively v and v is the velocity of planet at Apogee and Perigee respectively and T is the time period of revolution of planet round the sun a T2 c VATA Vpp d v V p 1 a b c 2 a b d 3 b c d 4 all x 2Gm Tp b T T 2GM

In an atom with Z 4 series given out by transition of electrons to the first orbit will belong to which region of the electromagnetic spectrum 1 Infrared 2 Visible 3 Ultraviolet 4 X ray

40 The number of gas molecules striking per second per square meter of the top surface of a table placed in a room at 20 C and 1 atmospheric pressure is of the order of k 1 4 x 10 23 J K and the average mass of an air molecules is 5 x 10 27 kg a 1027 c 1025 b 102 d 1029

212 Pre Medical Physics 83 The minimum projection velocity of a body from the 88 earth s surface so that it becomes the satellite of the earth R 6 4 x 10 m 1 11 x 10 m s 2 8 x 10 m s

3 A neutron star with magnetic moment of magnitude m is spinning with angular velocity o about its magnetic axis The electromagnetic power P radiated by it is given by um w cu where and c are the permeability and speed of Ho light in free space respectively Then a x 1 y 2 z 4 and u 3 b x 1 y 2 z 4 and u 3 c x 1 y 2 z 4 and u 3 d x 1 y 2 z 4 and u 3

A sound wave is used to measure the distance from the ship to the sea bed An electronic device placed in the ship traces a pulse sent from the ship and reflected pulse that returns The time base setting for the x axis is 60 ms per division The speed of sound wave in water is 1500 m s Find the distance from the ship to the sea bed Pulse sent from ship A B C D 1500 m 1080 m 900 m 540 m Reflected pulse from sea bed H H One division 60 ms

If an object made of substance A rubs an object made of substance B then A becomes positively charged and B becomes negatively charged If however an object made of substance A is rubbed against an object made of substance C then A becomes negatively charged What will happen if an object made of substance B is rubbed against an object made of substance C A B becomes positively charged and C becomes positively charged B B becomes positively charged and C becomes negatively charged C B becomes negatively charged and C becomes positively charged D B becomes negatively charged and C becomes negatively charged

If the P V diagrams of two thermodynamics devices working in a cyclic process are as shown in the figure then P 10 10 SV A B O A is a heat engine B is a heat pump refrigerator O O B is a heat engine A is a heat pump refrigerator both A and B are heat engines both A and B are heat pumps refrigerator V

The variation of density p with temperature T of an ideal gas of molecular mass M at constant pressure is plotted as shown in figure The pressure of the gas at state P will be O RT 3M 3RT M P

A very broad elevator is going up vertically with a constant acceleration of 2m s At the instant when its velocity is 4 m s a ball is projected from the floor of the lift with a speed of 4 m s relative to the floor at an elevation of 30 The time taken by the ball to return the floor is g 10 m s 1 N 1 1 3 s

13 For what value of the length I the deflection in the galvanometer will be zero in the following potentiometer arrangement The length of the wire AB is 4 m and its resistance is 10 Q A 0 5 A 2 V 1 0 8 m 2 1 6 m 3 2 4 m 1 wym DG B

good evening sir please tell only 3rd part I am not able to detect the the direction of force and deviation Motion in combined electric and magnetic fields A charge q mass m moving with velocity v enters region of magnetic field B as shown in diagram Assuming magnetic field to be constant within corresponding region find deviation of charge and time spent in it by the charge a m q v b m q v m q v Add your responses Type Text 0 34 A charge of mass m moving with velocity v enters a region of mannatic field Asked by 2589921 aesl id Standard XII Stream JEE Jul 14 2021 at 5 32 PM

10 ii 11 Imean rms idt 2 0 T T 2 ST12 1 dt T 2 T 2 T 2 210 T t io dt t io dt T 2 2 14 3 Ims N cational Services Limited Regd Office Aakash Tower 8 Pusa Road New Delhi 110C

43 Two sitar strings A and B are slightly out of tune and produce beats of frequency 6 Hz When the tension in string A is slightly decreased the beat frequency is found to be reduced to 3 Hz If the original frequency of A is 324 Hz the frequency of B is A 318 Hz B 321 Hz C 327 Hz D 330 Hz

Solvelancer Test The given reaction is an example of CuCl aq 2AgNO3 aq Cu NO3 2 aq 2AgCl s Solvelancer Test a Substitution reaction b Double displacement reaction c Addition reaction d All above are incorrect

ii Which of the bellow are correct regarding image and resolution More than one answer possible a An image should never alter the real object that is shown b By mapping a physical property of an object in two spatial dimensions you produce an image c The resolution of an image is determined by how close together two points are d The resolution in an image is independent of the image contrast e Any given image must have three spatial dimensions f One axis x or y is sufficient to produce an

Which relation regarding product of two vectors is incorrect NCERT Pg 151 1 x 0 2 3 axb a x 5 4 axb bx a b c ab a c

mathongo mathongo mathongo mathongo mathongo If one wants to remove all the mass of the earth to infinity in order to break mathon mathongo mathongo mathongamathongemathongo it up completely The amount of energy that needs to be supplied will be GM where x is thongomathongomathongo mathongs mathongs 5 R Round off to the Nearest Integer ngo 7 mathongo M is the mass of earth R is the radius of earth G is the gravitational thongo const mathongo mathongo

The equation y acos 2 nt 2 represents a wave with Amplitude a frequency n and wavelength A Amplitude a frequency 2n and wavelength 2 Amplitude a 2 2 1 Amplitude frequency 2n and wavelength frequency 2n and wavelength 1 Asked by 3447130 aesl id Standard XII Stream NEET Jul 14 2021 5 52

i spatial resolution is determined by More than one answer possible Select one or more A its amplitude B the image saturation C the sample health D the image contrast E the wavelength used for imaging F its refraction Ha

Nine identical conducting rods are arranged as shown in the figure The ends A and B are maintained at temperatues T and T Calcula the ratio of rate of flow of heat across AD to that of EB in the given arrangement in steady state C A T un 18

Displacement covered by a body in one revolution around a circle is if r is radius of circle 1 A 2 r B r 0 In the above questions distance covered by body is A 2 r C 0 B 5 m D None of these B r If a body covered 5 m distance then displacement covered by body may be A 5 m SI unit of acceleration is C 5 m D None of these 5m

with velocity 80 cm s a How should you hold your umbrella b You start walking towards the east with velocity 60 cm s How should umbrella you hold your c You are walking towards the west with velocity 60 cm s How should you hold your umbrella d You are walking towards the north with velocity 60 cm s How should you hold your umbrella e You are walking towards the south with velocity 80 cm s How should you hold your umbrella

The voltage time graph for triangular wave having peak 1 value V is shown in figure 1 3 V V Vo Vot The rms value of voltage in time interval from 0 to T 2 is som son 0 T12 T 2 4 V 2 2V 3 1

5 The force acting on a particle is 2 3k N Find the torque of this force about origin if position vector of force is 77 31 5k m NCERT Pg 157 1 7 16 11k 3 16 11k 2 16 11k 4 9 11k

estions N olar system satellites only of satellites and Build Up Your Understanding 6 Four particles of masses m 2m 3m and 4m are kept in sequence at the corners of a square of side a The magnitude of gravitational force acting on a particle of mass m placed at the centre of the square will be 24m G 1 2 6m G

B 1 of 1 Calculate the work done by an ideal gas in going from state A to state C in the figure for process ADC Figure 1 Express your answer in terms of some or all of the variables V VC PA and PC WADC Submit WABC Part B Calculate the work done by an ideal gas in going from state A to state C in the figure for process ABC Express your answer in terms of some or all of the variables V VC PA and Pc Submit Part C Request Answer WAC Submit Request Answer Calculate the work done by an ideal gas in going from state A to state C in the figure for process AC directly Express your answer in terms of some or all of the variables V VC PA and Pc Be Request Answer

In this why do we have to take the torque of Mw 2R A disc shaped body having a hole as shown in the figure of mass m 10 kg and radius R 10 m is performing pure rolling motion 9 on a rough horizontal surface In the figure point O is geometrical center of the disc and at this instant the centre of mass C of the disc is at same horizontal level with O The radius of gyration of the disc about an axis passing through C and perpendicular to the plane of the disc is R and at the instant shown the angular velocity 2 of the disc is c g rad sec in clockwise sense g is gravitation VR acceleration 10 m s Find angular acceleration in rad s of the disc at this instant C R 2

The two slits in Young s double slit experiment have widths in the ratio 1 2 The ratio of the intensity of light at the maxima and the minima in the interference pattern is 1 1 4 3 3 4 2 4 1 4 4 3

A compound microscope has lens with objective of focal length 0 5 cm and eye piece of focal length 5 and the lenses are separated by 7 cm What is the magnification of microscope when final image is formed at infinity O 12 O 14 O 15

Two circular coils A and B subtend same solid angle at point P lying on the axis of the coils as shown in figure Smaller coil B is midway between A and P Both of the coils carry equal current in the same direction Find the ratio of magnetic induction at point P due to coils A and B A B f d 2 d 2

For an unknown gas undergoing adiabatic process the variation of pressure with volume is shown in thei 1 T 1 2 2 units units and the angle OBA is 2 2 at point B as shown in the figure The adiabatic exponent of gas is The co ordinates of point B is given by P B AB is a tangent d

Maps E A bullet of mass 10 gram is fixed with spec of 500 m s into a door and gets embedde exactly at centre of door The door is 1 wide and weighs 12 kg Door is hinged alon one side and rotates about vertical ax without friction The angular speed of do just after bullet embeds into it is NCERT Pg 18 1 0 35 rad s 1 2 0 625 rad s 1 3 0 255 rad s 1

A particle of mass 2kg initially moves with a velocity of V 21 31 m s After collision from a fixed body its velocity becomes V 1 21 m s Then coefficient of resitution will be Question Type Single Correct Type 1 2 3 3 5 5 V 13 12