Physics Questions

Q15 Reciprocal of bulk modulus is called compressibility If pressure experienced by certain volume of liquid increases by two times the compressibility becomes O A Compressibility will not vary under pressure O B Decreases by two times O c Increases by two times O D Decreases by half of its original value

In ultrasonic level sensor Distance between receiver and transmitter is 80m and having flow velocity of fluid is 20m s with velocity of sound 40m s find time taken to ultrasonic waves to travel transmitter to receiver O 1 33s 1s 3 11s O 1 4s

09 Two positive point charges repel each other with force 0 36 N when their separation is 1 5 m What force do they exert on each other when their separation is 1 0 m O A 0 81 N O B 0 36 N O C 0 24 N O D 0 16 N

A galvanometer has a resistance of 3663 ohm A shunt S is connected across it such tha 1 34 of the total current passes through the galvanometer Then the value of shunt is Question Type Single Correct Type 1 36630 2 1110 3 107 70

JADHAV TANMAY NITIN Question 21 A machine is said to be ideal when M A V R Efficiency 100 M A V R Can t say

The Young s modulus of steel is twice that of brass Two wires of same length and of same area of cross section of steel and another of brass are suspended from the same roof If we want the lower ends of the wires to be at NEET 20 same level then the weights added to the steel and brass wires must be in the ratio of 1 4 1 2 1 1 4 2 1 niform pressure n the fractional decreas 3 1 2 Stei

A current I 10 A flows in a ring of radius ro 15cm made of a very thin wire The tensile strength of the wire is equal to T 1 5N The ring is placed in a magnetic field field which is perpendicular to the plane of the ring so that the forces tend to break the ring The magnetic field in T at which the ring is broken is

A plane electromagnetic wave travelling along X direction has electric field of amplitude 300 V m directed along the Y axis a What is the intensity of the wave b If the wave falls on a perfectly absorbing sheet of area 3 0 m at what rate is the momentum delivered to the sheet and what is the radiation pressure exerted on the sheet 8 854 x 10 2 C N m c 3 108 ms Take E Ans 119 529 W m2 1 195 x 106 N 3 98 x 10 7 P 1

Which of the following expression is correct to determine time period of squar wave generator T 2RCIn Option 2 R1 R2 R2 Anticna R1 R2 R2 RCIn 2RCIn 2R R Option 4 2R1 R2 R2 T 2RCIn 1 Option 1

A thin spherical conducting shell of radius R has a charge q Another charge Q is placed at the centre of the shell The electrostatic potential at a point P at a distance R 2 from the centre fo the shell is 1 20 4 R 2Q 4 R q 4 R 2Q 2 4TE R 4 ER 4 2q 4 E R q Q 2 4TE R

Question 11 If frictional force is 100N and the normal reaction is 200N then the resultant reaction is 300N 150N 322 16N 00

An AC source of angular frequency w is connected with a resistance R and an uncharged capacitance C in series The potential difference across the resistor is in phase with the initial potential difference across the capacitor for the first time at the instant assume that at t zero 0 emf is

volts After that it starts decreasing Determine the frequency of the voltage source Ans 1 Hz 9 An A C circuit contains only an inductor The frequency of voltage source is 159 2 Hz And Vm 100 V The inductance of the inductor is L 1 H Obtain the expression for the current flowing in the circuit Consider voltage to be V V cost Ans I 0 1cos 1000 t A

An AC Bridge enables us to perform precise measurements for reactance measurement determining the Q factor and frequency measurement An AC Bridge is shown in Figure Q 2 b UNIVE ww DeMux Oscilloscope Channel 2 Rec Figure Q 2 b AC Bridge ADC TITELT

5 Figure 10 W18 shows two cylinders of radii r and r having moments of inertia I and I about their respective axes Initially the cylinders rotate about their axes with angular speeds and o as shown in the figure The cylinders are moved closer to touch each other keeping the axes parallel The cylinders first slip over each other at the contact but the slipping finally ceases due to the friction between them Find the angular speeds of the cylinders after the slipping ceases 1 1 Figure 10 W18 102 12

70 71 72 73 74 30 A particle moves along the x axis in such a way that its position coordinate x varies with time t according to the expression x 2 5t 6t Its initial velocity is A 3 ms B 5 ms C 2 ms D 3 ms 4 sec 0 de 0 Stane do 0 A log tan 0 B log sec 0 C log cos 0 D log sin 0 The acceleration a in ms2 of a particle is given by a 3t 2t 2 where t is the time If the particle starts out with a velocity v 2 ms at t 0 then find the velocity at the end of 2 s A 36 m s B 20m s C 18m s D 25m s The acceleration of a particle varies with time t seconds according to the relation a 6t 6 ms 2 Find velocity and position as functions of time It is given that the particle starts from origin at t 0 with velocity 2 ms A 3t2 6t 2 t 3t 2t C 1 6t 2 t 3t 2t PARAGRAPH TYPE QUESTIONS B 31 6t 2 t 3t 2t D 3t2 6t 2 t 3t t 76 A 0 77 B 1 C 1 Paragraph 1 Q No 75 to 77 The position of a body moving along a straight line is given by X 16 t 6t where X is in metre and t in second 75 D Find the position of the body at t 1s A 5m B 10 m Find the velocity of the object at any time t A V 16t 12 t B V 16 121 C V 16 12t Find the acceleration of the body at any time t A 6m s B 2 m s C 10 m s C 15m D 20m D V 12t D 12 m s 1

In a capillary tube experiment a vertical 30 cm long capillary tube is dipped in water The water rises up to a height of 10 cm due to capillary action If water temperature increases then the new height of water column in capillary becomes A B 30 cm D greater than 10 cm Cequal to 10 cm less than 10 cm Correct Answer

A conducting loop of radius r is placed concentric with another loop of a much larger radius R so that both the loops are coplanar Find the mutual inductance of the system of the two loops Take R r Ans 2 Hor 2R 1

4 In Young s experiment the distance between two slits is 1 mm and the distance between two consecutive bright fringes is 0 03 cm Now on displacing the screen away from the slits by 50 cm the distance between two consecutive dark fringes is doubled Find the wavelength of light used Ans 6000 5 If the difference of time taken by two waves emitted from coherent sources to reach a point is an integral multiple of the period of the wave show that the constructive interference will occur at that point

Two coils placed near to each other have number of turns equal to 600 and 300 respectively On passing a current of 3 0 A through coil A the flux linked with each turn of coil A is 1 2 x 104 Wb and the total flux linked with coil B is 9 0 x 105 Wb Find 1 self inductance of A 2 The mutual inductance of the system formed by A and B ooo ooo00 A B

A diode is a device that allows current to be carried in only one direction the direction indicated by the arrowhead in its circuit symbol Find approximately in terms of AV and R the average power delivered to the diode circuit of the figure Assume that the diodes are ideal and AV is the rms voltage applied to the circuit R www Diode Diode R ww 2R R www

If the electric potential of the inner metal sphere is 10 volt that of the outer shell is 5 volt then the potential at the centre will be 1 10 volt var 15 volt a 2 5 volt 4 0

Question 10 A Force of 60 N acting tangentially to a circle of radius 2 m It s moment about diametrically opposite point will be Nm 120 240 30 60

Wing ratings PIV Peak Inverse Voltage and temperature is true Si diodes have wider temperature ranges and higher PIV than Ge diodes O Si diodes have lower PIV and narrower temperature ranges than Ge diodes Si diodes have lower PIV and wider temperature ranges than Ge diodes OSi diodes have higher PIV and narrower temperature ranges than Ge diodes s The emitter current is always Greater than the base current Less than the base current Less than the collector current equal to the collector current

A galvanometer has a resistance of 30 ohm and a current of 2 mA is needed to give a full scale deflection What is the resistance needed to convert this galvanometer into an ammeter of 3 A range 1 70 22 3 0 7 Q 2 0 02 S 4 20 Q

A flat dielectric disk lying in x y plane of radius R 1 m carrying charge density o 1 C m is rotating with angular velocity 1 k rad s inside an external magnetic field B 1 1 T It denotes its magnetic dipole moment and torque acting on it then 0 1 rad s 0 1 2 FAm 7 1 7 N m kAm 1 E 4

SolveLancer Test Their velocities are shown in graph below In the period of 20 sec what is the maximum seperation between them X m s 10 5 SolveLancer Test a 75 m b 50 m c 72 5 m d 52 5 m a 10 b 20 time sec Y VA 10 m s 10 20 time sec

A conducting bar of 2 m length is allowed to fall freely from a 50 m high tower keeping it aligned along the east west direction Find the emf induced in the rod when it is 20 m below the top of the tower g 10 ms 2 Earth s magnetic field is 0 7 x 104 T and angle of dip 60 Ans 1 4 mV

10 In an A C circuit maximum voltage and maximum currents are 220 V and 4 4 A respectively Calculate power and power factor in the circuit Here X 30 2 and R 40 2 Ans 387 2 W 0 8 11 In an A C circuit R and L are connected in series with source of maximum 220 V and frequency 50 Hz If L 1 H and R 100 22 Find the maximum current in inductor and phase difference between voltage and current Ans 0 668 A 72 20

2 Assertion A cyclist bends inwards from his vertical position while turning to secure the necessary centripetal force Reason Friction between the tyres and road provides him the necessary centripetal force

Ans LA 24 mH MB 30 HJ There are 1 5 x 104 turns in the winding of a toroidal ring The radius of circular axis of the ring is 10 cm The radius of cross section of ring is 2 0 cm Find inductance of the ring Ans 0 57 HI

2 Light of wavelength 5000 is incident on a slit of width 2 mm in Fraunhoffer diffraction Find the width of second maximum on the screen placed at the focal plane of the convex lens of a focal length 100 cm The lens is placed close to the slit Ans 0 025 cm 3 An apparatus for Young s experiment is immersed in a liquid of refractive index 1 33 The distance between two slits is 1 mm and that between slits and screen is 1 33 m The wavelength of light used is 6300 in air 1 Find the distance between two consecutive bright fringes 2 Keeping the apparatus in the liquid one of the slits is covered with a glass plate of refractive index 1 53 If in

28 A current of 8 A flows in a metallic conductor of cross section 1 cm and length 10 km Free electron density of copper is 5x1028 m The time taken by the electron to travel from one end of the conductor to the other is 1 108 sec 3 107 sec 2 10 sec 4 105 sec

L 8 1 mH C 12 5 F and R 100 2 are connected in series with A C source of 230V and frequency 500 Hz Calculate voltage across the two ends of resistance Ans 230 V In medium wave broadcast a radio can be tuned in the frequency range 800 kHz to 1200 kHz In L C circuit of this radio effective inductance is 200 H what should be the range of the variable capacitor Ans 88 pF to 198 pF An inductor of 0 5 H and 200 2 resistor are connected in series with A C source of 230 V and frequency 50 Hz then calculate 1 Maximum current in the inductor 2 Phase difference between current and voltage and time difference time lag

2 5 of the total energy of a 100 W bulb is converted into visible light Calculate the average intensity at a spherical surface which is at a distance of 1 m from the bulb Consider the bulb to be a point source and let the medium be isotropic

x x 51 5 n 4 tan n Which of following can not be polarised 1 Radio waves 2 Ultraviolet rays 3 Infrared rays 4 Ultrasonic waves A polaroid is placed at 45 to an incoming light of intensity I Now the intensity of light passing through polaroid

2 In an Young s experiment the distances between two slits and that between slits and the screen are 0 05 cm and 1 m respectively Find the distance between 3rd bright and 5th dark fringes Take the wavelength of light equal to 5000 Ans 1 5 mm 3 In Young s experiment fifth bright fringe produced by light of 4000 superposes on the fourth bright fringe of an unknown wavelength Find the unknown wavelength Anc 5000

8 A rectangular coil of sides 2 cm and 3 cm respectively has 10 turns in it It carries a current of 1 A and is placed in a uniform magnetic field of 0 2 T in such a manner that its plane makes an angle 60 with the field direction The torque on the loop is a 6 0 10 N m b 6 0 105 N m d 6 0 N m J K CET c 3 1 2 x 10 N m

A particle of mass m and charge q moves with a constant velocity v along the positive x direction It enters a region containing a uniform magnetic field B directed along the negative z direction extending from x a to x b The minimum value of v required so that the particle just enter the region x b is qvB m q b a B m qaB m C 0

Three concentric conducting spherical shells carry charges as follows 4Q on the inner shell 2Q on the middle shell and 5Q on the outer shell The charge on the inner surface of the outer shell is 1 0 3 O 2 4 Q 4 20

For a first order reaction the time taken to reduce 1 the initial concentration to a factor of is 10 minute 4 If the reduction in concentration is carried out to a factor of then time required will be 1 16 1 10 minutes 2 20 minutes

jo 0 25 where is the wavelength of the light used obtain the conditions for constructive and destructive interference at point P 7 In Young s double slit experiment if the distance between two slits is double than the wavelength of light used Prove that a maximum 5 bright fringes will be obtained on the screen 0

If a parallel beam of light of circular cross section having radius 10 mm falls on the surface of glass slab at an angle 30 with the surface of slab then the radius of emergent beam is about O 12 5 mm 15 cm O 14 5 mm O 10 cm

Assertion A car moving on a horizontal road may be thrown out of the road in taking a turn due to lack of proper centripetal force Reason If a particle moves in a circle describing equal angles in equal intervals of time Then the velocity vector changes its magnitude

13 Derive expression P Vs Irms cosd for an A C circuit 14 Using P Vrms Irms cos discuss the special cases for power consumed in an A C circuit 15 Explain necessity of transformer for power transmission and distribution Solve the following examples 1 Find the necessary inductance if 110 V 10 W ratting bulb is to be used with 220 V A C source having frequency 50 Hz Ans L 6 67 H

97 The refractive index of vitreous humor in our eye ball is1 34 Visible light of wavelength ranges from 402 nm to 670 nm as measured in air The wavelength range just approaches retina within vitreous humor is O A 300 nm to 500 nm O 8 340 nm to 540 nm O C 320 nm to 520 nm O D 280 nm to 480 nm

240 A particle of mass 2 kg is moving in circular path with constant speed 10 m s The change is magnitude of velocity when particle travels from P to Q will be assume radius of circle is 10 ali to elvons moling n 30 Lesignado tols lonls AV P 1200 20 instendo al potom ielnoshod s no noitem elitbejme not epas A loups apfosire to sprc tot maclo 1 10 3 2 20 3

b 70 3b A particle moves along the x axis in such a way that its position coordinate x varies with time t according to the expression x 2 5t 6t Its initial velocity is A 3 ms B 5 ms C 2 ms D 3 ms x 4 sec 0 d0 71 0 72 Stane do 73 A 0 74 B 1 C 1 C t 6t 2 t3 3t 2t PARAGRAPH TYPE QUESTIONS A log tan 0 B log sec 0 C log cos 8 D log sin 0 The acceleration a in ms2 of a particle is given by a 3t 2t 2 where t is the time If the particle starts out with a velocity v 2 ms at t 0 then find the velocity at the end of 2 s D 22 A 36 m s B 20m s C 18m s D 25m s The acceleration of a particle varies with time t seconds according to the relation a 6t 6 ms 2 Find velocity and position as functions of time It is given that the particle starts from origin at t 0 with velocity 2 ms A 3t2 6t 2 t 3t 2t B 3t 6t 2 t 3t 2t D 3t 6t 2 1 3t t Find the position of the body at t 1s A 5m B 10 m C 15m Find the velocity of the object at any time t A V 16t 12 t B V 16 121 Find the acceleration of the body at any time t A 6m s B 2 m s C V 16 12t Paragraph 1 Q No 75 to 77 The position of a body moving along a straight line is given by X 16 t 6t2 where X is in metre and t in second 75 76 77 C 10 m s D 20m D V 12t D 12 m s 1

An observer is at 2 m from an isotropic point source of light emitting 40 W power What are the rms values of the electric and magnetic fields due to the source at the position of the observer c 3 x 108 m s 8 854 x 10 2 C N m Ans E rms 17 3 V m B 5 77 x 10 8 T rms A plane electromagnetic wave travelling along X direction has electric field of amplitude 300 V m directed along the Y axis a What is the intensity of the wave b If the

O 32 V F is force and V is velocity List l 1 11 B a Q L T III 3 R ML IV a S T U a P Speed of light undefined Force momentum Which of the following combination is correct Q II T O III III P List Il