Physics Questions

1 1 2 3 1 4 Q 19 CST 02 1 5 m Rough Surface 213 4 1 5 Thermodynamic state variables Equation of state 4P Po PV diagram for a thermodynamic process is shown in fgure Then choose the correct option during the process A Smooth Vo B 4 1 Temperature continuously decreases 2 Temperature continuously increases 3 Temperature first decreases and then again increases 4 Temperature first increases and then decreases 1 2

Case Study 2 An art projector is equipment used by artists to create exact copies of artwork to enlarge artwork or to reduce artwork A basic art projector used a light bulb and a lens within a box The light rays from art work being copied are collected onto a lense at single point The lens then projects the image of art work onto the a screen as shown Projector Art work Lens Bulb light SOUTCO Image G

16 g sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1g of the element remained undisintegrated Half life of the element is uch feuchard 16 fazi Arc atas fa 35 3714 1 2 hour fen a 2 1 hour 3 1 2 hour 4 1 4 hour fra anl

6 Two trains 101 m and 99 m in length are running in opposite direction with velocities 54 km h and 36 km h In what time they will completely cross each other 1 20 s 3 10 s 28s 101 4 16 s

7 ALLEN Thirteen resistances each of resistance RQ are 17 connected in the circuit as shown in the figure The effective resistance between A and B is 4R 3 RQ R R 2 2RQ 4 2R R R 1 fai v R fanger i B B 4R 3 RQ R 2 2RQ 2R

5A PV diagram for a thermodynamical process is shown in the figure Then during process from A to B choose the correct option 3P Po B A V 2Vc 1 Temperature continuously falls 2 Temperature first falls ther rises 3 Temperature first rises then falls

O If the distance between successive compressions and rarefaction in a sound wave is 2 m and R velocity of sound is 360 m s then the frequency is 180 Hz 2 45 Hz 3 120 Hz 4 90 Hz A 2m V 360m 6 DEX 360 hozz

Q 8 The velocities of a particle in SHM at positions x and x are v and v2 respectively its time X1 v1 period will be 1 2n 0 0 x 2 x x x v v 3 2 2 2n 4 2 x x 2 2 0 32 0 2 x x V 2 71

ASSAGE He Ne laser produces light of wavelength 6328 Angstrom at room temperature Choose the correct options Marks The frequency of the emitted radiation OPTIONS 4 74 10 12 Hz 4 74 10 13 Hz

A wire has a non uniform cross sectional area as 3 shown in figure A steady current i flows through it Which one of the following statement is correct 1 The drift speed of electron is constant 2 The drift speed increases on moving from A to B 3 The drift speed decreases on moving from A to B 4 The drift speed varies randomly vakia tu fferfera fres are an fay n A UNA U t 1 2 AB 3 ABR 4 3 affia art

201 Two cars A and B start moving from the same poin with same speed v 5 km minute Car A moves towards North and car B is moving towards East Wha is the relative velocity of B with respect to A 1 5 2 km min towards South East 2 5 2 km min towards North West 3 5 2 km min towards South West 4 5 2 km min towards North East

A frictionless track consists of a horizontal part of unknown length which connects to a vertical semicircle of radius r as shown An object which is given an initial velocity is to move along the track in such a way that after leaving the semicircle at the top it is to fall back to its initial position What should the minimum length of the horizontal part be

3 3 RQ 4 20 The total current supplied to the circuit by the 18 battery is 1 A 6V Each of the www 2 2 A www 1 50 20 www 6 02 3 4 A www 352 4 6 A 3 RQ d and after vif 1 1 A ne questionpaper 6V 20 ww 1 50 2 2 A 2R www 6Q 3 4 A www 302 1 4 6 A

A hollow metallic sphere of radius 20 cm surrounds a concentric metallic sphere of radius 5 cm The space between the two spheres is filled with a nonmetallic material The inner and outer spheres are maintained at 50 C and 10 C respectively and it is found that 160 x Joule of heat passes radially from the inner sphere to the outer sphere per second Find the thermal conductivity of the material between the spheres

a The required conductivity of an n type silicon sample at T 300 K is to be o 10 0 cm 1 What donor impurity concentration is required What is the electron mobility corresponding to this impurity concentration b A p type silicon material is required to have a resistivity of p 0 20 0 cm What acceptor impurity concentration is required and what is the corresponding hole mobility

2 Position of a particle moving along x axis is given by x 2 8t 4t the distance travelled by particle from t 0 tot 2 sec is fahit cu fa faf x 2 8t 4t t 0 t 2 34 1 10 2 8 3 12 4 16

When a light wave of frequency 5x10 4 Hz is passed through a medium of refractive index 1 5 then its wavelength will become GR for 35 10 4 H ETARI I Found 1 5 1 4000 2 4500 3 6000 4 9000

For the circuit shown with R 1 0 R 2 0 E 2V and E E3 4 V the potential difference between the points a and b is approximately in V Main 8 April 2019 1 a 2 7 R www E wwww R b 2 3 a wwwww b R www R E c 3 7 wwwwwww E3 R d 3 3

Which of the following is correct for stomata apparatus of dicot plants GC Guard cells SC Subsidiary cells 1 Non green GC Green SC Pore 2 Green GC Green SC Pore 3 Green GC Non Green SC Pore 4 Non green GC Non Green SC Pore

In the measurement of physical quantity X C1 3D of the quantities A B C and D are 2 2 4 and 5 respectively Then the minimum amount percentage error in the measurement of X is contributed by 5271 1 A X A B C1 D the percentage error introduced in the measureme 2 B A B C D 324 fed 2 2 4 5 3 C 4 D

equilibrium position x 0 270 m 70000 voooo X 0 Find the effective spring constant of the system Submit Answer Tries 0 12 The glider is now released from rest at x 0 270 m Find the maximum x acceleration of the glider Submit Answer Tries 0 12 Find the x coordinate of the glider at time t 0 370T where T is the period of the oscillation Submit Answer Tries 0 12 Find the kinetic onoray of the glider at v 2

A strong magnetic field is applied to a proton at rest Then a the particle moves in opposite direction of the applied field b the particle moves in the direction of the applied field c the particle continues to be at rest consider the proton as a charged particle only d the particle executes circular motion in magnetic field

Q18 A thin bar of length L has a mass per unit length 1 that increases linearly with distance from one end If its total mass is M and its mass per unit length at the lighter end is 20 then the distance of the centre of mass from the lighter end is 2014 Online a b c d 21373 L 2L M 3 201 4M AL 8M 201 4M 201 6M

A 4 inches rounded cable has insulation resistance of 503 mega ohms If the specific resistance of the insulation material is 3x10 ohm cm per 500 m of length Determine the radius of the conducting material

An incompressible non viscous fluid is injected into a conical pipe at its orifice as schematically shown in the figure The pressure at the orifice of area A is P Neglecting the effect of gravity and assuming streamline flow which one of the following plots correctly predicts the pressure along axis of the cone Options PA Xo Por Vo P Xo PA XP Xo PA Po Xo P Po Xo R 4 V oc Solution Answer A AV Constant A x x

ALLEN A copper wire and an iron wire each having an area 6 of cross section A and length L and L are joined end to end The copper end is maintained at a potential V and the iron end at a lower potential V If o and a are the conductivities of copper and iron respectively the potential of the juction will be 2 3 0 V 0 V 01 L 02 L2 GIVI 02V L L 01 L 0 L2 01 L1 02 L2 01 V 0 V 01V 0 V 01 L 02 L Consider a thin square sheet of side L and 7 LL and fa ftare fit fac fava V data are farfava 1 2 3 a 0 V 0 V 01 L1 02 L2 GIVI 02V L L 01 L 0 L 01 L1 02 L2 01 V 02V 01V 0 V 01 L 0 L f feigur frival and ver P

27 View In English A 2 volt battery a 150 resistor and potentiometer of 100 cm length all are connected in series If the resistance of potentiometer wire is 50 then the potential gradient of the potentiometer wire is 1 2 3 4 rect Answer 1 ar Answer 3 tus incorrect 0 005 V cm 0 05 V cm 0 02 V cm 0 2 V cm Add to Bookmark List Dimicuity Lover Ow Topic prysics Falternating current oor

Two coherent waves P and Q meet at a point in phase and superpose Wave P has an amplitude of 1 5 cm and intensity I The resultant intensity at the point where the waves meet is 31 Calculate the amplitude of wave Q 6 09 pr

No 15 View In English Six moles of an ideal gas perfomrs a cycle shown in figure If the temperature are TA 600 K TB 800K TC 2200 K and To 1200K the work done per cy is 1 2 3 4 Correct Answer 3 20 kJ 30 kJ 40 KJ 60 kJ

4 A deuteron of kinetic energy 50 keV is describing a circular orbit of radius 0 5 m in a plane perpendicular to the magnetic field B The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is a 25 keV Le b 100 keV c 200 keV d 50 keV

A trolley of mass 300 kg carrying sand 200 kg in it is moving uniformly with speed of 40 km h on a frictionless track After a while sand starts leaking out of a hole on the track What is the speed of the trolley after entire sand is leaked out 1 24 km h 2 30 km h 3 66 km h 4 40 km h

Figure shows the anode potential vs photo current graph when photons of 6 eV are incident on cathode in a photoelectric In set up the same set up if photons of 8 eV and same intensity are incident on cathode then anode potential vs photo current graph will be assume 100 efficiency of photons to eject photo electrons in both cases experiment experimental photocurrent t 3V 0 anode potential Question Type Single Correct Type i l

In Young s double slit experiment the y coordinates of central maxima and 10th maxima are 2cm and 8cm respectively When the YDSE apparatus is immersed in a liquid of refractive index 1 5 the corresponding y coordinates will be A 2cm 4cm C 2cm 6cm B 3cm 6cm D 4 3cm 16 3cm

Topic Current Electricity From Mobility Illustration To Point Potential Method Infinite Ladder Circuit 1 E denotes electric field in a uniform conductor 1 i corresponding current through it Va drift velocity of electrons and P denotes thermal power produced in the conductor then which of the following graph is incorrect K 2 KV 1 1 2 E E E a faga di i Affor K 2 2 K 3 P VA deduc E E

3 On a fixed smooth semicircular ring of radius R one end of a spring of spring constant k and natural length R 3 is attached at end A as shown in the figure The another end of the spring is fixed to a massless bead which can slide without friction on the ring The bead is placed in such a position that the spring makes angle 30 with diameter of AB If the bead is released then the initial acceleration of the bead is The system lies on a horizontal plane KR A B A C 180 J C 2m S 3 1 KR m D kR 3 1 m KR 3m la block F N A

Three electric charges are arranged on a straight line as shown in the figure Q Q2 R R Select True or False for the following statements If Q is positive Q is negative and Q3 is positive then Q MIGHT feel a net force to the right If Q is negative Q2 is negative and Q3 is positive then Q MUST feel a net force to the right If Q is positive Q is negative and Q3 is negative then Q MUST feel a net force to the right If Q is positive Q2 is negative and Q3 is positive then Q MUST feel a net force to the right Submit Answer Tries 0 6 In the above figure R 1 58 m Q 2 06x10 6 C Q Q and Q3 Q Calculate the total force on Q Enter your response as positive if the force is to the right and negative if the force is to the left

The kinetic energy K of a particle moving along a circle of radius R depends on the distanc covered s as K as where a is a constant The force acting on the particle is 1 2 s R 2as R A C 2as B 2as 1 D 2a ing from 100N

Consider a thin square sheet of side L and 7 thickness t made of a material of resistivity p The resistance between two opposite faces shown by the shaded areas in the figure is 1 Directly proportional to L 2 Inversaly proportional to t 3 Dependent on L 4 Independent of t 1 f fanger pfa and arter Lyou left cft aufen ufgan anat fauda graf an Telegram ne questionpaper 1 L 2 t 3 L 4 m

4 Independent of t There are two wires of the same length and of 8 the same material and radii r and 2r The ratio of their specific resistance is 1 1 2 2 1 1 2x 14 41 4 can r2r3 1 1 2 m 1 4 vard fr fafere fa 2 1 1 LAY 4 1

A batter hits a 0 3 lb baseball at a speed of v 110 ft s an angle of a 30 so that it strikes an angled wall and rebounds If d 150 ft h 4 ft 0 55 and the coefficient of restitution is 50 find the speed of the ball just after it hits the wall a Just before impact the ball has a speed of ft s along the wall b The ball travels at ft s just after impact round your answers to 3 significant figures ft s normal to the wall and

ASSAGE te Ne laser produces light of wavelength 6328 Angstrom at room temperature Choose the correct options Marks 1 The energy difference between two energy levels emitting this radiation in joule OPTIONS 2 14 10 19 314x10 1911

A cassette recorder uses a plug in transformer to convert 120 V to 12 V with a maximum current output of 493 mA a What is the current input b What is the power input MA W c Is this amount of power reasonable for a small appliance Select an answer

A current flows in a wire of circular cross 2 section with the free electrons travelling with a mean drift velocity v If an equal current flows in a wire of twice the radius new mean drift velocity is 1 V 2 V 2 3 V 4 4 none of these Teren voi var und weat firen ya r ngtat en unos segment from u shtua signed in grm 1 V 2 V 2 3 V 4 4

Viow in English Two radio active substances A and B have decay constant 5A and A respectively At t 0 they have the same number of active nuclei The ratio of number of active nuclei of A to those of B will be 1 2 after a timo interval 1 2 3 4 orrect Answer 3 tatus unattempted 4 2A 1 2A 1 4A

In the figure shown below the maximum and unknown possible minimum resistance X that can be measured by the post office box are Xmax and Xmin respectively Then the ratio of these two resistances is In this experiment we take out only one plug in arm AB and only one plug in arm BC but in arm AD we can take any no of plugs E G D P Q 1000 10010B10 10010000 I ERG 5000 2000 1000 500 100R 200 200 Question Type Single Correct Type unknown resistance X

O No 22 View in English Electric charge on sphere A is equal to electric charge of sphere B The sphores are joined by conducting wire Then the wire is removed the common potential on each sphere is found to be the charge a oach sphere before joining is 2 3 4 Correct Answer 1 Your Answer 3 Vr 2K 2K 1 1 2K 1 2 K 1

1 2 Two blocks 1 and 2 of equal mass hang from the massless frictionless pulley system in Figure 1 i If block 2 is displaced by Ay2 what is the displacement Ay1 of block 1 If block 2 moves with velocity v2 with what velocity v1 does block 1 move ii If block 2 moves downward a distance Ah2 What is the corresponding change in the potentia energy AU of the two block system in terms of m g and Ah

The point A moves with a uniform speed along the circumference of a circ of radius 0 36 m and covers 30 in 0 1 s The perpendicular projection P from A on the diameter MN represents the simple harmonic motion of P The restoration force per unit mass when P touches M will be A 9 87 N B C 0 49 N 50 N 100 N M 0 36 m 30 P 0 1 s N

1 In the arrangement shown in Fig 1 24 the masses m of the bar and M of the wedge as well as the wedge angle a are known The masses of the pulley and the thread are negligible The friction is absent Find the acceleration of the wedge M a M

D A river 2 km wide is flows at the rate of 2km h A boatman who can row a boat at a speed of 4 km h in still water goes a distance of 2 km upstream and then comes back The time taken by him to complete his journey is 1 60 min 2 70 min 3 80 min 4 90 min