Physics Questions

A ring of mass m slide from rest on the smooth rod as shown in the figure due to the block of mass m Pully and string are massless Then find the speed of ring when the string become straight Given 9 60 A 4 gh A A B B C C DI C B 2gh 0 B smooth m C 2 2gh D 8 gh

Write any 3 advantages and disadvantages of ferrous alloys For the toolbar press ALT F10 PC or ALT FN F10 Mac TUS Paragraph V Arial

E An ice block with some stone pieces embedded in it is floating in a water tank If ice melts the level of water in the tank 1 Increases 2 Decreases 3 Remains constant 4 Can t be said 1 g 3

Four rods of equal lengths AB BC CD and DA have mass m 2m 3m and 5m respectively are placed in x y plane see figure given AB BC CD DA 4 meters The centre of mass of the system is satisfy x and y are in meters YA D 5m 3m C 2m X

A square of side a is lying in xy plane such that its two adjacent sides are lying on the x and y axes If an electric field E Ek is applied on the square then the flux passing through the square is Only one correct answer A Eoa i

A metal sphere A of radius r charged to a potential is enveloped by a thin walled conducting spherical shell B of radius r Then potential of the sphere A after it is connected to the shell B by a thin conducting wire will be 1 6 5 1 3 1 1 41 B 4 1 2 4 r r 1 1

18 19 20 21 22 23 24 25 26 27 28 dx A 0 d 2 dx A log 2 dx A 2 cos 2x x A B 1 B 1 C 2 D 0 Differentiate y 3x w r t x A 12x 4x 10 B 12x 4X10X C 12x 4x 10 D 2x 4x 10 d sin 2 x B cos 2x A 3 units Find the speed S t 6t 15 A 5 m s The value of x dx A cos 2x dx A 0 B x C 2 x D 2 x Displacement of a body is given by x 1 2t 3t The value of instantaneous acceleration is given by A 4 units B 6 units C 5 units D 2 units A car moves along a straight line whose equation is given by S 12 t 3t 20 where s is in metre and t is in second The velocity of the car at start will be A 7 m s D 16 m s B 6 m s C X B 9 m s C 12 m s A particle moves along a straight line such that its displacement s at any time t is given by S t 6t2 3t 4 The velocity of the particle when its acceleration is zero B 8 units C 6 units of a car at t 4s given distance C 2 m s B The value of sin x dxis A 0 B 1 3 C 2 sin 2x B 1 D 2x C 3 C 1 D sin 2x C 1 2 D 2 metre is defined by D 9 units D 15 m s D 2 D 1 2

2 A uniform thin rod of mass m and length equal to the diameter of earth is kept normally to the surface of earth The magnitude of gravitational force acting on the rod will be M mass of earth R Radius of earth 1 mg 3 mg 3 4 mg mg 2 to

1 8 A thin prism P with 4 and made from glass of refractive index 1 54 is combined with another thin prism P made from glass of refractive index 1 72 to produce dispersion without deviation The angle of the prism P is degree

17 Trees have a special tissue called xylem through which water rises from root to the branches Assuming tissue to be of uniform cross section find vest maximum radius of xylem tissue in a 10 m high coconut tree so that water can rise up to the top surface tension of water 0 1 N m and angle of contact of water with xylem tube 60 g 10 m s 1 1 cm 2 1 mm

1 The current voltage relation of a diode is giver by I e1000 V T 1 mA where the applied voltage V is in volts and the temperature T is in degree kelvin If a student makes an error measuring 0 01 V while measuring the current of 5 mA at 300 K what will be the error in the value of current in mA

A force of 20N is applied to a block at rest as shown in figure After the block has moved a distance of 8m to the right the direction of horizontal component of the force F is reversed in direction Find the velocity with which block arrives at the starting point V 2 F 1 3 16 7 3 8 7 3 2 4 5 7 3 28 3 0 25 m 2kg 37

From the given position as shown in the figure the plank starts moving towards left with initial velocity and acceleration zero 8 m s The rod flies in the air and falls back on the plank With all surfaces smooth what should be the least possible length so that the rod doesn t fall off the plank A 4 84 m B 3 84 m C 5 62 m D 4 62 m 37

whose curved portions are semicircules of radius 1 m The adjacent graph describes the variation of speed of the car with distance moved by it starting from point P The time t required for the car to complete one lap is equal to 6K second Find K take ln 2 2 A 4 C 12 Im S 0 2m Figure 1 112 B 8 D 16 1m

Wires 1 and 2 carrying currents i and 12 are inclined at an angle to each other What is the force on a small respectively element dl of wire 2 at a distance of r from wire 1 as shown in figure due to the magnetic field of wire 1 2 Ho 2 r 8 dl Ho a ii2dl tan 0 2 r Fii2dl sin 0 C Ho Ho 2 r indl sin e apd i1i2dl cos 0 b d

A uniform electric field having strength E is existing in x y plane as shown in figure Find the p d between origin O A d d 0 Z OJO 1 Ed cose sin0 3 2Ed M A d d 0 X 2 Ed sin0 cos0 4 None of these

2 A uniform rod OA of mass m and length L is hinged at end O with the ceiling and other end A of the rod is attached with a thread which is attached with horizontal ceiling at point P If end A of the rod is slightly displaced horizontally and perpendicular to the rod and released then time period of small oscillations will be 1 T 27 3 T 27 m L L sine 3g 2Lsin0 2 T 2 4 T 2T 2L sine g Lsine

Dor Choose the incorrect statement with regards to gravitational force 1 Gravitational force is unaffected by the intervening medium between two masses 2 Acceleration due to gravity decreases non linearly with height above earth s surface 3 Kepler s law of areal speeds is based on principle of conservation of linear momentum 4 Total mechanical energy of an orbiting satellite increases with distance from the earth s surface

16 Internal forces acting in a system of particle can change 1 Both kinetic energy and linear momentum of the system 2 The linear momentum but not the kinetic energy of system 3 The kinetic energy but not linear momentum of the system 4 Neither linear momentum nor kinetic energy of

A thin walled hemispherical shell of mass m and radius R is pressed against a smooth vertical wall Through a very small aperture at its top water of density p is filled in it completely Minimum magnitude of force is to be applied to the shell for liquid not to escape from it Weight of 2 hemispherical shell is mg and total mass of water is M R p

40 A ring of mass m and radius R is being rotated about its axis with angular velocity if to increases then tension in ring 1 Decreases 2 Increases 3 Remains same 4 Zero

An elastic conducting cord of length lo and force constant k is fastened to two nails N and N as shown Unif magnetic field B is present as shown If constant current is passed through cord then in steady state N A B C D X B N Shape of cord would be circular arc Shape of cord would be parabolic arc Shape of cord would be elliptical arc Magnetic force of cord is lloB

Read the following source and answer any four out of the following questions Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field There are two types of charges positive and negative charges Also like charges repel each other whereas unlike charges attract each other i Charge on a body which carries 200 excess electrons is a 3 2 x 10 18 C b 3 2 x 10 18 C c 3 2 10 17 C d 3 2 10 17 C

A semi circular disc is moving rightward with velocity vo and acceleration ao both rightward at a certain moment Find the velocity and acceleration of rod at the same moment of time which is constrained to move in direction perpendicular to the direction of motion of disc as shown in the figure R TTTTTT 777777 P Vo

b Two blocks A and B are placed on inclined planes as shown in Fig 3 b The block A weighs 1000 N Determine minimum weight of the block B for maintaining the equilibrium of the system Assume that the blocks are connected by an inextensible string passing over a frictionless pulley Coefficient of friction A between the block A and the plane is 0 25 Assume the same value for B 161 30 Fig 30h 60

8 Two blocks M and M are tied with string and kept at rough surface as shown in figure If F 20 N is applied on the block of mass M then the friction force on the blocks at f 2 s is 1 kg M H 0 6 F 2t 1 6 N 10 N 2 kg M M 0 5 2 6 N ON

View In English In the figure a charged sphere of mass m and charge q starts sliding from rest on a vertical fixed circular track of radius R from the position shown There exists a uniform and constant horizontall magnetic field of induction B The maximum force exerted by the track on the sphere is 2 3 ect Answer 3 Answer 4 mg 3mg qB 2gR 3mg qB 2gR mg qB 2gR m B

An object which is thrown or projected into the air subject to only the acceleration of gravity is called a projectile and its path is called its trajectory This curved path was shown by Galileo to be a parabola Parabola is represented by a polynomial If the polynomial to represent the distance covered is p t 51 40t 1 2 What is the degree of the polynomial a 0 b 1 c 2

sir could u pls explain how to solve this sum A bar of cross section A is subjected to equal and opposite tensile force F at its ends If there is a plane through the bar making an angle Q with the plane at right angles to the bar in the figure F F a Find the tensile stress at this plane in terms of F A and Q b What is the shearing stress at the plane in terms of F and Q c For what value of Q is tensile stress a maximum

7 A point charge is kept at the mid point between two large parallel grounded conducting plates Assuming no gravity the charge is displaced a little towards the right plate The charge will now a stay where it is b move towards the right plate c move towards the left plate d oscillate between the plates

A space telescope in orbita around the Earth discovers a new planet which is observed to move around the Sun by an angle of 4 72 milliradians in a year Assuming a circular orbit estimate the distance in A U of the planet from the Sun 121

7 A glass flask with volume 200 cm is filled to the brim with mercury at 20 C How much mercury overflows when the temperature of the system is raised to 100 C The coefficient of linear expansion of the glass is 0 40 x 10 5 K 1 Cubical expansion of mercury 18 x 10 5 K 1 The

No 24 View In English Consider the situation shown in the figure The capacitor A has a charge q on it whereas B is uncharged The charge appearing on the capacitor B a long time after the switch is closed is DH 3 Correct Answer 1 Your Answer 2 Zero q 2 q 29 B

28 Two cars A and B are moving on a straight line in the same direction with velocities v and v respectively When they are separated by distance of then car A starts decelerating with value a and car B starts accelerating with a The minimum value of d so that the cars do not collide is 1 3 2 a 8 2 V V 2 a a V V 4 21a 8

33 If velocity v of a particle moving on a straight line as a function of position x is given as v x 5x 4 then acceleration of the particle when velocity of the particle is zero is units are standard 1 Zero 2 2 3 3 4 4 Telegram n

stion 13 The refinery plant storing crude oil in a storage tank made up of carbon steel of density 7 53 g cm is exposed of an area 0 097 cm to the environment for 358 days so that 0 175 grams of the material is lost by corrosion Find the corrosion rate in mm year Write the answer in 2 decimal point

Which of the following technique can be used in time division multiplexing for transmission of analog signals pulse position modulation O pulse amplitude modulation pulse width modulation Oit is not possible to transmit analog signals using time division multiplexing

Twelve paintballs are shot at the same speed but different angles at a sloped wall Perhaps it s the side of a pyramid or some other architecturally interesting building They hit the wall at different heights Which has the highest speed when it hits the wall O The paintball that hits highest on the wall O There is not enough information given to answer the question O The paintball in the middle O The paintball that hits lowest on the wall

98 Resultant of two vectors A and B is R Now mag nitude of vector is doubled keeping direction same then magnitude of the resultant becomes B Angle between vector A and B is 120 Then magnitude of A is equal to A B C B 2 B 2 B D 4 B

n be image We have to find the total resistance of it The answer to this is that in this circuit sho rt circuit will happen please give a detailed solution of this quest ion diagram give This question is of higher level than class10 Voltage of battery is a volt y AM R 12 Rg d R 2L R 1 R ID R 12 R10

A very long carrying a current t kte at k 0 as a function of time t 0 taken as a Counter clockwise current to be positive A circular conducting coil of radius 2R is placed in the equatorial plane of the solenoid and concentric with the solenoid itself Then the current induced in the outer coil is correctly shown as a function of time by which of the following graph B t 0 adius N IS

A coil of resistance R and self inductance L is connected to a battery of emf E through a switch S The switch is closed at t 0 Calculate the rate of increase of current at the moment when current is one third of its maximum value

If the potential difference V applied across a conductor is increased to 2V with its temperature kept constant free electrons in a conductor i remain the same ii become half of its previous value iii be double of its initial value iv become zero

5 Two plane mirrors P and Q are kept parallel to each other as shown in the figure A light ray is incident at an angle 60 at a point just inside one end of mirror P The plane of incidence coincides with the plane of the figure Then the maximum number of times the ray undergoes reflections including the first one before it emerges out it 2 3m 0 2 m a 60

Two bodies A and B are moving towards a plane mirror with speeds VA and v respectively as shown in the figure The speed of image of A respect to the body Bis A VA VB B VA VB C V D V V m m Normal 45 45 Normal

A rigid conducting wire bent as shown is released to fall freely in a horizontal magnetic field which is perpendicular to the plane of the conductor If magnetic field strength is B then the emf induced across the point B and D when speed is v is X BL 1714

The electric potential between a proton and an electron is given by V Voln where ro is a constant Assuming Bohr s model to be applicable write variation of In with n n being the principal quantum number 1 In x n 2 In x 1 n 3 rn xn 4 rn x 1 n

17 A particle of mass m moving with a constant velocity 20 v hits another identical stationary particle If coefficient of restitution is e then ratio of velocities of two particles after collision is 18 1 09 1 0 1 e 2 1 6 4 1

For a particle executing SHM the displacement x is given by x A cos wot Identify the graph which represents the variation of potential energy PE as a function of time t and displacement x 2003 2M O PE xxxxx b II IV a I III c II III PE X d I I

An HCl molecule has rotational translational and vibrational motions If the rms velocity of HCl molecules in its gaseous phase is v m is its mass and kg is Boltzmann constant ther its temperature will be B mv 2019 Main 9 April 1 a 3k A mi 2 Mv 7k 6k mv 330 mv 54 c FOODIT