Physics Questions

9 In the circuit shown the value of capacitive reactance X if net current is in phase with the applied voltage V is nearly 1 14 Q 102 www 5Q www X 20 2 000 2 34 Xc HI

A wedge of mass m and a block of mass m are in equilibrium as shown Inclined surface of the wedge has an inclination a with the horizontal Each surface is frictionless The normal reaction on the wedge may be B m g sin a cos a D m g m g sin a cos a A m g cos a C m g m g cos a m1

Two pendulum bobs A and B of mass m and 2m respectively are simultaneously released from a height H above the lowest point making an elastic collision at the lowest point If after the first collision A and B rise to heights h and he respectively then h 2h is 1 3H 2 H 3 H 3 4 2H

A rough L shaped rod is located in a horizontal plane and a sleeve of mass m is inserted in the rod The rod is rotated with a constant angular velocity in the horizontal plane The lengths and 2 are shown in the figure The normal reaction and frictional force acting on the sleeve when it just staps slipping are u coefficient of static friction between the rod and the sleeve A N mw N m g 0 B f mw l D f N 3 4 la 2

23 A liquid of Refractive index 1 6 is contained in the cavity thin of a glass specimen of refractive index 1 5 as shown in the figure If each of the curved surface has radius of curvature of 0 20 m then the arrangement behaves as a Glass Liquid 1 Converging lens of focal length 0 25 m 2 Diverging lens of focal length 0 23m 3 Diverging lens of focal length 0 17m 4 Converging lens of focal length 0 72m

3 C 84 If the maximum height of a particle after third collision from ground is 60 m calculate the initial height from which it was dropped if the coefficien of restitution is e 1 3 60 60 2 60 4 60

Unpolarised light is incident from air on a plane surface of a material of refractive index u At a particular angle of incidence i it is found that the reflected and refracted rays are perpendicular to each other Which of the following options is correct for this situation NEET 2018 1 Reflected light is polarised with its electric vector parallel to the plane of incidence 2 Reflected light is polarised with its electric vector perpendicular to the plane of incidence 3 tan

The above graph shows PE of a particle At x 1 m the KE of particle is 1 J The particle reverses its of motion at x SolveLancer Test 5 U e 1 0 I a 1 m b 5 m c 6 m d 2 m I 1 I I I 1 X 1 X 1 11 I I I 5 I I I I x m

In Young s double slit experiment the separation d between the slits is 2 mm the wavelength of the light used is 5896 and distance D between the screen and slits is 100 cm It is found that the angular width of the fringes is 0 20 To increase the fringe angular width to 0 21 with same and D the separation between the slits needs to be changed to NEET 2018 1 1 8 mm 3 1 7 mm 2 1 9 mm 4 2 1 mm

In a Young s double slit experiment if there is n initial phase difference between the light from th two slits a point on the screen corresponding the fifth minimum has path difference NEET 2019 Odisha 2 5 1 2 1 11 1 2 3 102 4 94

When an external resistance is connected to a battery of emf 80 V an ammeter records 200 mA If a voltmeter is connected to the two ends of the external resistance it records 60 V Determine the rate of supply of energy from the battery and also the rate of consumption of energy by the resistance 16 W 12W

9 Which method is used to induce an emf or current in a loop in AC generator a A change in the loop s orientation b A change in its effective area c Both a and b d Neither a nor b

In the figure shown calculate the linear acceleration of the blocks Mass of block A 10 kg Mass of block B 8 kg Mass of disc shaped pulley 2 kg Take g 2 kg Take g 10 m s Consider sufficient friction at the surface of pulley LUULLU LLL B A

1 A person is unable to see an object beyond 30cm Find the power of lens in dioptre to correct the vision 10 2 1 3 3 4 2 In a compound microscope the focal length of objective lens is 1 2cm and focal length of eyepiece is 3 0cm When the object is kept at 1 25cm in front of objective the final image is formed at infinity Magnifying power of compound microscope should be nearest to Use D 25cm 1 200 2 100 4 150 w dw o Chapter Ray Optics and Optical Instruments 1 25cm 3 68cm 2 35cm 4 100cm An object O is kept in air in front of a thin plano convex lens of radius of curvature 10cm It s refractive index is and medium towards right of 20 5 10 3 3 400 3 An astronomical telescope consists of two convex lenses If focal length of objective is 1 0m and angular magnification is 10 find the length of the tube between objective and eyepiece such that final image is formed at infinity 1 1 2m 20 3 2 1 1m 3 1 4m 4 1 5m 4 An object is placed at a distance of 15cm from a 8 convex lens of focal length 10cm Find the distance at which a convex mirror of focal length 10cm should be placed on the other side from the lens so that final image coincide with the object itself 1 20cm 2 10cm 3 15cm 4 30cm 20cm 1 60cm to the left of lens 2 12cm to the left of lens 3 60cm to the right of lens 7 Focal length of plano convex glass lens of refractive index 1 5 is 15cm A small object is placed at A as shown The plane surface is silvered The image will be formed at 9 4 30cm to the left of lens 6 A lens made of glass of refractive index 1 5 has focal length 25cm in air It s focal length in water of 4 refractive index will be plane surface is water of refractive index3 What should be the distance x of the object so that the rays become parallel finally Telegram netquestion paper 1 5cm 3 20cm Ratio of dispersive power of lens combination of lenses is 1 2 10cm 4 None of these 00 1 At 20cm from P 3 At 25cm from P 3 A point object O is placed at distance of 15cm from concave morror between a concave and a plane mirror separated by 25cm Considering 1st reflection from concave mirror position of image after 3rd reflection will be Radius of curvature of concave mirror is 20cm 15cm 10cm for achromatic 2 At 30cm from P 4 At 40cm from P

13 A hollow cylindrical conductor of length 1 m has inner and outer radii 1 mm and 2 mm respectively If resistivity of the material is 2 x 10 8 22 m then resistance in between the terminals A B as shown below is 2 mm 1 mm 1 1 2 x 10 30 3 2 1 x 10 62 A K COB On or fc 501360 station ry ston 1 m 2 1 2 x 10 6 blest 4 2 1 x 10 6

In damped oscillations the amplitude of oscillations is reduced to one third of its initial value ao at the end of 100 oscillations When the oscillator completes 200 oscillations its amplitude must be Question Type Single Correct Type 1 2 a0 2 a0 4

1 A charged particle q m is projected with velocity v 51 m s in a region of space where a uniform magnetic field B 41 31 T exist If maximum possible displacement along z direction of the particle during its motion is 3 k q m then value of k m 2 in S l unit

their volumes is least the diameter of sphe 41 A given quantity of metal is to be cast into a half cylinder with a rectangular base and semicircular ends Show that in order that the total surface area may be minimum the ratio of the length of the cylinder to the diameter of its semi circular ends is 2 Thos the product of its breadth and square of its donth T 30

V3 4 N3P 32 A machine gun of mass 10kg fires 10gm bullets at the rate of two every second Each bullet comes out with a vel ocity of 200 m s The velocity of recoil of the gun at the end of the fourth second after firing starts is 1 1 6 m s 2 0 8 m s 3 3 2 m s 4 2 0 m s

For an object placed 16 cm in front of a spheric mirror a four times magnified inverted image formed The focal length of the mirror is 1 12 8 cm 2 6 4 cm 3 51 2 cm 4 25 6 cm

1 Identical metal plates are located in air at equal distance d from one another The area of each plate is equal to A Evaluate the capacitance of the system between P and Q if the plates are interconnected as shown in Fig 4 72 a C OP 2 OP 5 Po b d P Q B3E04 Ceq 2 dp 0 G Cs CP

The density p of a piece of metal of mass m and volume Vis given by the relation p m V If m 275 32 0 01 g and V 36 41 0 01 cm then the percentage error in p will be a 0 01 c 1 b 0 02 d 0 03

An impulse 30 Ns is given to the block of mass 2 kg in downward direction as shown in the figure As a result of the impulse A both the blocks start moving with 5 m s in opposite directions B Centre of mass of the system is moving upward C the net impulse acting on the block of mass 2 kg is 10 Ns D the net impulse acting on the block of mass 4 kg is 10 Ns 4 kg 2 kg

14 The following figure shows a part of a circuit the potential difference between C and B Vc Ve is 12 5A D 22 12 V C www 1 10 V 2 13 V 3 20 V 32 3 V E 42 2A Www B 62 6 A

The specific heats Cp and C of a diatomic gas A are 29 J mol K and 22 J mol 1 K 1 respectively Another diatomic gas B has the corresponding values as 30 J mol 1 K 1 and 21 J mol 1 K 1 respectively Which among the following is correct Question Type Single Correct Type 1 2 A has one vibrational degree of freedom and B has two vibrational degrees of freedom A has one vibrational degree of freedom and B has zero vibrational degree of freedom

Two identical springs of force constant k are connected 1 in series 2 in parallel and support a mass m The ratio of the period of oscillations of the series arrangement with that of the parallel arrangement is Question Type Single Correct Type 1 2 3 1 1 1 2 1 4

Consider two parallel uniform rods parallel to y axis each of mass m and length 7 Velocity of centre of mass of each rod is 2voi and the angular velocity is w A particle R of same mass m is moving with velocity voi parallel to the velocity of centre of mass of each rod as shown On the basis of above information choose the correct match Given vo lw 2 4464 93 uz fur AA 4c 03 2 A A GWAIA M H yc hu R Try uzme ug i GOTHIT ng i i THIT i v i H farfa 21 34 QAA H MM2 92 as gdaa mo P R S V B R List f 1 o y Jiefan 2v Q centre of rod AB AB 00 2 Kinetic energy of rod AB with respect to R RAB R Buf B D Buf Angular momentum of rod PQ with respect to the PQ Kinetic energy of rod PQ with respect to R PQ m u 3 X Angular momentum of rod AB with respect to R RAB List II 1 k mvol 6 2 k mvol 3 3 mvol k 2 4 mv 5 mv P 4 Q 1 R 5 S 2 P 5 Q 1 R 3 S 2 C P 5 Q 1 R 5 S 2 Correct Answer P 5 Q 2 R 5 S 2

Yellow light is used in a single slit diffraction experiment with slit width of 0 6 mm If yellow light is replaced by X rays then the observed pattern will reveal A that the central maximum is narrower C less number of fringes B more number of fringes D no diffraction pattern 1999

A force of 20N acts on 16 kg block kept on a smooth horizontal surface for 6 se and then removed Find the distance covered by it in 10 s a 52 5m b 62 5m c 42 5 d 32 5

Set a five rupee coin on a stiff card covering an empty glass tumbler standing on a table as shown in Fig 9 7 Give the card a sharp horizontal flick with a finger If we do it fast then the card shoots away allowing the coin to fall vertically into the glass tumbler due to its inertia The inertia of the coin tries to maintain its state of rest even when the card flows off

Draw the No load phasor diagram and equivalent circuit of a practical single phase transformer and highlight all necessary parameters

A block of mass 4 kg is moving with a velocity of 12 m s on a horizontal smooth surface A force of 6N started acting on the block in the opposite direction of velocity After what time from the instant the force comes in to action the distance covered is equal to 2 5 times the displacement and what the velocity is then a 13 2sec 7 8m s c 11sec 5 8m s b 12sec 8m s d 26 4ec 7 8m s

35 Two co axial metallic long cylindrical shell carry current of equal magnitude in opposite direction If the radii of the cylinders are a and b a then which plot represents the variation of magnetic field with the distance r from the axis of the cylinder 1 3 AB r ar br AB r a r b 2 4 AB AB 1 r a r b

If X is the total tension for all the strings of the given pulley what is the S I unit value of X 20 TA AT TA AT TA AT 60 Kg If X is the total tension for all strings of give

Two slits in Youngs experiment have widths in he ratio 1 25 The ratio of intensity at the maxima and minima in the interference pattern max is L 1 3 9 121 2 4 9 4 min Re AIPMT 2015 49

A force of 30 N acted on a block of mass 12 kg at rest for 6 sec and then the direction of the force is reversed a What distance the block moves before coming to rest b After what time the block reaches the starting point and with what velocity a 80 m 6 2 2 sec 15m s c 70 m 6 2 2 sec 15m s b 45 m 6 2 2 sec 15m s d 40 m 6 2 2 sec 15m s

In the figure shown a cubical block is held stationary against a rough wall by applying a force F Select the incorrect statement a Frictional forcef Mg b F N Nis normal reaction c F does not apply any torque about C M d N does not apply any torque about C M M 2a a a F

For a submerged plane in a liquid the resultant hydrostatic force F on one side of a plane is related to area A centroidal depth yC depth of centre of pressure yp and the depth of bottom edge yb as Option 1 F w Ayp Option 2 F wA yc yp Option 3 F w Ayc Option 4 F w Ayb

3 A real image of half the size of the object is produced by a spherical mirror On moving the object away from the mirror by 0 30 m the size of the image becomes that of the object Calculate the radius of curvature of spherical mirror Ang

5 points The equation E k s r3 represents the magnitude of Select one O Electric force of point charge O Electric field at location on the dipole axis O Electric field at location on the perpendicular to dipole axis O Electric field of point charge

A gas is expanded from volume V to volume V2 in three processes shown in the figure If U U Uc and Up represent the internal energies of the gas in state A B C and D respectively the which of the following is not correct P V 1 1 UB UA 0 3 UD UA 0 Isobaric Isothermal Adiabatic V B D 2 2 UC UA 0 4 UB Uc UD

A bucket that has a mass of 25 kg when filled with sand needs to be lifted to the top of a 20 mete tall building You have a rope that has a mass of 0 1 kg m that must be secured to the bucket It takes 1 meter of rope to secure the bucket Once the bucket reaches the top of the building it onl has mass 22 kg because there was a hole in the bottom and sand was leaking out at a constant r while it was being lifted to the top of the building Find the work done lifting the bucket sand and rope to the top of the building

Two Polaroids P and P are placed with their axis perpendicular to each other Unpolarised light is incident on P A third polaroid P3 is kept in between P and P such that its axis makes an angle 45 with that of P The intensity of transmitted light through P2 is NEET 2017 1 3 2 2 4 10 4 lo

WHEN WE STUDY ABOUT ELECTR OMAGNETISM WE ENCOUNTER A CONCEPT KNOWN AS ELECTROM AGNETIC INDUCTION DISCOVERE D BY MICHAEL FARADAY AS WE KNOW THAT ELECTRON IS RESPONSIBLE FOR ELECTRICITY AND PHOTONS ARE RESPONSIBL E FOR ELECTROMAGNETISM According to standard model of p article physics SO DESCRIBE IN DETAIL WHAT H APPENS TO AN ELECTRON SO TH AT IT TRANSFORMS INTO MECHA NISM OF PHOTONS WHICH GIVES BIRTH TO ELECTROMAGNETIS M

29 In the two positions of the lens keeping distance between object and screen fixed size of the image is 4 cm and 9 cm The size of the object is 1 5 cm 2 13 cm 3 6 cm 4 9 6 cm

Two liquids A and B are at temperature of 75 C and 15 C Their masses are in the ratio of 2 3 and their specific heats in the ratio 3 4 If these two liquids are mixed then the resulting temperature will be Question Type Single Correct Type 1 2 3 4 90 C 70 C 35 C 60 C

7 A solid conducting sphere of radius a having a charge Q is surrounded by a connectric conducting spherical shell of inner radius 2a and outer radius 3a as shown in figure Find the final potential of inner surface of shell when switch is closed a c kQ b 2a kQ 4a d kQ 3a kQ 6a 3a 2a

The interference pattern is obtained with two coherent light sources of intensity ratio n In the interference pattern the ratio 1 3 n n 1 max min Imax min NEET Phase 2 2016 n n 1 2 4 2 n 1 2 n n 1 will be

An equilateral triangle ABC of side length a is made The sides AB and AC have resistance per unit length and side BC has resistance per unit length 2 An ideal battery of EMF V is now connected across BC as shown The magnetic field intensity at the centroid of the triangle ABC is n HOV 4 Consider only the field due to sides AB BC and AC of the triangle and neglect the field due to other wires sib ni elaiks T then the value of n is B C

Question 5 A series RLC circuit containing inductance a resistance of 600 an of 100mH and a capacitor of 100uF are connected in series across a 100V 50Hz supply Calculate the total circuit impedance the circuits current power factor and draw the voltage phasor diagram