Physics Questions

A hollow spherical shell is compressed to half its radius The gravitational potential at the centre 1 increases 2 decreases 3 remains same 4 during the compression increases then returns at the previous value

4 A projectile is projected with speed vo at angle 0 from the horizontal ground The radius of curvature of the projectile is maximum at 1 Highest point 2 Between point of projection and highest point 3 Between highest point and point of landing 4 Point of projection

D Molar specific heat of oxygen at constant pressure Cp 7 2 cal mol C and R 8 3 J mol K At constant volume 5 mol of oxygen is heated from 10 C to 20 C the quantity of heat required is approximately 1 26 cal 2 360 cal 3 260 cal 4 500 cal

A body is just floating in a liquid their densities are equal If the body is slightly pressed down and re leased it will 1 start oscillating 2 sink to the bottom 3 come back to the same position immediately come back to the same position slowly

A cylinder of radius R is kept embedded along the wall of a dam as shown Take density of water as p and length of cylinder as L The pgLR Find the X vertical force exerted by water on the cylinder is value of X

60 Figure below shows a square loop of side 0 5 m and resistance 10 2 The magnetic field has a magnitude B 1 0 T The work done in pulling the loop out of the field slowly and uniformly in 2 second is V X X X X X X X X X X X X 1 3 125 x 10 J 2 6 25 10 4 J 3 1 25 10 J 4 5 0 10 4 J X X X X X X X X X X X xx X x X XX X X X X X X

A B C An ideal monoatomic gas undergoes different types of processes which are described in column 1 Match the corresponding effects in column II The letters have usual meaning Column I Column II A P 2V p If volume increases then temperature will also increase q If volume increases then temperature will decrease B PV constant C C C 2R D C C 2R Choice a b r For expansion heat will have to be supplied to the gas s If temperature increases then work done by gas is positive P Q R Match p 9 r

Full Marks 4 If ONLY the correct numerical value is entered as answer Zero Marks 0 In all other cases An amount Q of heat is added to a monoatomic ideal gas in a process in which the gas performs a work Q 2 on its surrounding The molar heat capacity of gas in cal K mol for the process

The masses and radii of the earth and moon are M R and M R respectively Their centres are at distance d apart The minimum speed with which a particle of mass m should be projected from a point midway the two centres so as to escape to infinity is 2G M M 1 4GM M d 2 4G M M d G M M d 9

Which of the following statement is true about End Fire antenna You can select multiple correct options Only one element is driven All elements are driven Quarter wave dipoles are used Half wave dipoles are used 2

Three moles of an ideal gas being initially at a temperature To 300 K were isothermally expanded n 5 0 times its initial volume and then isochorically heated so that the pressure in the final state becomes equ that in the initial state The total amount of heat transferred to the gas during the process equals Q 87kJ Find the ratio Y C C for this gas R 25 3 J mol K In 5 1 6

A U tube having horizontal arm of length 20 cm has uniform cross sectional area 1 cm It is filled with water of volume 60 cc What volume of a liquid of density 4 g cc should be poured from one side into the U tube so that no water is left in the horizontal arm of the tube 1 60 cc 3 50 cc 2 45 cc 4 35 cc

Question No 17 In an LCR series circuit R 10 Q XL 20 0 and Xc 10 0 The average value of current for a complete cycle source voltage V 20 sin 301 is 2 A 0 5 A 3 A Zero

If 21 31 k and B 41 aj 2k are parallel to each other then value of a can be Question Type Single Correct Type 1 2 3 4 6 6 1 5 1 5

Zero Marks 0 In all other cases wall has two layer A and B each made of different material both the layers have the same thickness The thermal conductivity of the material A is twice that of B Under thermal equilibrium t fference across the wall B is 36 C The temperature difference across the wall A for the flow of heat through its thickness is in C

1 Time period of vibration of a bar magnet in vibration magnetometer is T If the magnet is cut into n identical parts such that length of each part is equal to length of original magnet then time period of vibration of one part in the vibration magnetometer is 2 3 n T 2 nT 4 T 57 Due to in the e intens position 1 9 2 4 4

8 Measurement of focal length of a convex lens by putting an object at a distance u from the lens and v is th distance of real image from lens then the correct grap between y and u is 1 3 u t U 2 4 U u

17 An inductor of inductance L a capacitor of capacitance C and a resistor of resistance R are connected in series across E E sin The reading of hot wire voltmeter connected across resistor is 1 E E 2 Eo t LC 4 Zero 23

The ionization potential of H atom is 13 6 V Photons of energy 12 75 eV are made to incident on sample of H atoms at ground state How many spectral lines are expected in emitted radiation 1 2 3 4 2 6 4 1

The antenna current produced by an unmodulated carrier is 2 7 A into n antenna with a resistance of 300 ohm When amplitude modulated the antenna burrent rises to 3 A What is the percentage of modulation 68 49 84 69 86 49

In the given figure the coefficient of friction between block and incline is u If the block slides on inclined with constant velocity the friction acting on block will be A u mg sin0 B u mg tan 0 m C mg sin 0 D mg cos 0

Find the energy stored in the capacitor in J in steady state in the given circuit shown A 7 C 9 B 8 D 6 AD 2 F RC CA A 192 ww 2V 6V 492 292 ww www 312 HH 3V SEV 62 www

An electromagnetic wave is travelling to the east At one instant at a given poin ts E vector points straight up What is the direction of its B vector North Down South Read More Fast

2 If radiations ranging from ultraviolet to infrared are passed through hydrogen gas at room temperature then the absorption lines will be observed in the 1 Lyman series 2 Balmer series 3 Paschen series 4 All of these

39 A small square loop of wire of side I is placed inside a large square loop of side L L I If the loops are coplanar and their centres coincide the mutual inductance of the system is directly proportional to 1 7 3 2 4 L 10 mH

Q 5 Velu stood on the platform but he felt as if he was still on a moving train Why What made him feel miserable 02 Q 6 i Velu travelled without a ticket Why 01 ii How did he escape the ticket collector s attention 01 Q 7 Why had Velu run away from home 02 Q 8 Why did he decide to follow the strange girl 02

go from magnetic equator towards geographic south pole the angle of dip will become More and more vertically downward and perpendicular to the surface at magnetic pole 2 More and more vertically upward and become perpendicular to the surface at magnetic pole 3 Less and less vertically downward and become horizontal at magnetic pole 4 Less and less vertically upward and become horizontal at magnetic pole South pos the leng 1 Zest CA 77 The sho 1

41 A light of wavelength medium of refractive index 1 5 Frequency and wavelength of light in the medium respectively are 1 5 x 1014 Hz 6000 5 x 1014 Hz 4000 3 4 10 3 10 3 x 1014 Hz 4000 x 1014 Hz 6000

In the arrangement shown in the figure find the equivalent capacitance between A and B symbol have their usual meaning each capacitor has identical dimensions A 3 A ok d 4 Ask d A nk Read More B

A cylindrical bar magnet is cut parallel to magnetic axis such that it is divided in two equal parts then the mage pole strength of a single piece of bar magnet will become Half Two times Four times Eight times

To determine the accurate position of the target GPS receiver the GPS system must receive signals from satellites ID 1101924461 NOTE SCREENSHOT PROHIBITED A ID 1101924461 O 2

32 An electron in a hydrogen atom makes a transition from h N to n N The frequency of the electron in the final state is eight times that in initial state The possible values of N and are 1 N 6 2 2 N 8 N 1 3 N 8 N 2 36 4 1 9 36

2 In YDSE an electron beam is used to obtain interference pattern If speed of electrons is increased 1 No interference pattern will be observed 2 Distance between two consecutive fringes remains same 3 Distance between two consecutive fringes will decrease 4 Distance between two consecutive fringes will A In the fol A is foll 1 2

In the figure shown find the accelerations of blocks A B and C immediately after string connecting between block B and block C is cut A a 3g ap g ac gl 5 a 301 a a 0 m A eeeeee m B m C B a 2g ag ac 0 R a 0 a 0 a gl

n If the potential energy of electron in Bohr s atomic model of hydrogen is taken as zero in its first orbit then the P E of electron in the 2nd orbit of same hydrogen atom will be 1 6 8 eV 2 20 4 eV 4 27 2 eV

51 Four identical rods each of mass m and length 1 make a frame in xy plane as shown Calculate its moment square of inertia about the x axis 5 1 3me 3 ml y 7 C md 12 4 2 ml 7me 3 4 None of these 1 1

A fire hydrant delivers water of density p at a volume rate L The water travels vertically upward through the hydrant and then does 90 turn to emerge horizontally at speed V The pipe and nozzle have uniform cross section throughout The force exerted by the water on the corner of the hydrant is S L SULI

Question No Out of the following choose the ray which does not travel with the velocity of light in va X rays Microwave 7 rays B rays

water A resistor of resistance R carries a variable current The current decreases with time continuously such that its value becomes half after every 5s Starting from t 0 the total charge which passes through the res by the time current becomes zero is Q The time from the beginning in which the half the total charge passed through the resistor R is in s

Po Two moles of an ideal monoatomic gas are contained in a vertical cylinder of cross sectional area 1 cm as shown in the figure The piston is frictionless and has a mass 1 kg At a certain instant a heater starts supplying heat to the gas at a constant rate 10 J s Find the steady velocity of the piston under isobaric condition All the boundaries are thermally insulated Po 1x 105 Pa g 10 m s m

The ratio of inductive reactance of an inductor when connected with a source of frequency 10 Hz and 40 Hz respectively is 1 2 1 4 2 3 5 4

Which one value of electric field is possible due to Uniformly charge ring Question Type Single Correct Type 1 2 3 3 KQ 7 R 7 KQ 19 R 7 KQ 13 R

under the condition of 15 Inductive time constant for the given L R circuit is 16 mH oooo 160 88762 42 16 2 wwww 6 V www 16 02 422 www 1 ms 2 3 ms 3 4 ms 4 8 ms 5 A convex lens and a convex mirror of focal lengt

Point charge q 2 C and 92 1 C are kept at points x 0 and x 6 respectively Electrical potential will be zero at points Question Type Single Correct Type 1 2 3 4 x 2 and x 9 x 1 and x 5 x 4 and x 12 x 2 and x 2

Last Leap 3 In a double slit experiment the the slit is d The screen is at a distance D from the slits and is the wavelength of light used If a dark fringe is formed opposite to a slit on the screen the order of fringe is 2 3 d 2D 2ND D d 2 D d 2d

9 Angular width of principal maximum in single slit diffraction is 0 1 radian Angular width of second order secondary maxima is 10 05 radian 2 0 1 radian 3 0 5 radian

75 For a series LCR circuit quality factor is o and potential difference across circuit is B The potential difference across inductor in resonance state will be 1 Zero 2 ap 3 2 8 a

A magnet of magnetic moment Moscillating freely in earth s horizontal magnetic field makes n oscillations per minu If the magnetic moment is doubled and the earth s horizontal field is also doubled then number of oscillations mac per minute would be 2n 4 2n 2 2n

Which of the following statements is NOT correct A An object placed between f and 2f of a concave mirror produces a real image beyond 2f B An object placed between the pole and the focus of a concave mirror produces a virtual and enlarged image C A convex mirror always produces a virtual image independent of the location of the object D The virtual image produced by a convex mirror is erect and magnified

ich of the following statements regarding a deflection magnetometer is correct The external magnet is kept in East West in tan A position and North South in tan B position O The external magnet is always kept in East West position O The arms are always kept in East West position O The arms are kept in East West position in tan B arrangement and North South in tan A arrangement