Basic Physics Questions and Answers

2 Electric charge on sphere A is equal to electri charge of sphere B The spheres are joined In conducting wire Then the wire is removed th common potential on each sphere is found to v The charge on each sphere before joining is 1 2 1 2 5 3 2K 4 2K

We know that electrical drives need a const ant source of energy to run however after w ork done where does the residual amount of electricity goes Does it follow any loop to c ome back to its original source

P T diagram is shown in given figure Which of the followin graph correctly represents the corresponding V T diagram P B C D

Question 6 A large empty container is sliding without friction down a smooth inclined plane of inclination From a point on the bottom of container a particle is projected with speed u with respect to box at an angle with the bottom of container The velocity of the particle relative to the box after time t is The Options ucosai usina gt a b u cos a gt sin i usina gt cos0 c u cos a usina gt cos 0

A tree trunk of diameter 2R cm lies in a horizontal field A lazy grasshopper wants to jump over the trunk Find the minimum take off speed of the grasshopper that will suffice Air resistance is negligible

8 9 A particle of mass 2 kg is subjected to a two dimensional conservative force given by Fx 2x 2y Fy 2x y x y in m and F in N If the particle has kinetic energy of 8 3 J at point 2 3 find the speed in m s of the particle when it reaches 1 2 A small block slides along a path that is without friction until the block reaches the section L 3m

To set a halfwave rectifier circuit a student used zener diode with V 3V instead of PN junction diode as shown in figure Predict the output obtained by him V 3V 1 220V 6V 3 reler 8 5V 8 5V 5 5V rele R M A 8 5V 4 5 5V 2 8 5V 8 5V opp directs

57 A wire frame in the shape of an equilateral triangle is hinged at one vertex so that it can swing freely in a vertical plane with the plane of the A always reaming vertical The side of the frame is The time period in seconds of 3 small oscillations of the frame will be A B 2 IT m D IT

Three blocks of masses 6kg 4kg and 2kg are pulled on a rough surface by applying a constant force 20 N The values fo coefficient of friction between blocks and surface are shown in figure u 0 2 6 kg 4 kg 14 Friction force on 4 kg block is a 4 N b 6 N 2 kg 13 In the arrangement shown tension in the string connecting 4 kg and 6 kg masses is a 8 N b 12 N c 6 N d 4 N 20 N c 12 N d 8 N

4 30 60 90 1 Velocity of a stone projected 2 second before it reaches the maximum height makes angle 53 with the horizontal then the velocity at highest point will be 2 15 m s 1 20 m s 3 25 m s 4 80 3 m s 4 30 60 90 21 2 Bm 1 20 m s 3 25 m s 4 80 3 m s for 2 15 m s

45 The mean radius of angular speed on its own axis is w and the acceleration due to gravity at the earth s surface is g What will be the radius of the orbit of a geostationary satellite CBSE AIPMT 1992 Rg a c R g w R w g 1 3 1 3 b d 1 3 R g 1 3

A converging lens of focal length fis placed in front of and parallel to a plane mirror An object is placed on the optical axis of the lens on the segment not included between the lens and the mirror What should be the distance between the lens and the mirror so that final magnification is independent of the distance of the object from the lens

A He ion in the excited state on transition to the ground state emits two photons in succession with wavelengths 108 5 nm anc 30 4 nm What is the quantum number n corresponding to the excited state of He ion

A block of mass m 5 kg is placed on rough surface k us 0 6 Two forces are acting on it The maximum value of F such that system is under equilibrium is 100 N 5 kg 1 120 N 370 N F 2 130 N 4 60 N F 50X016 10 F 30 100 F 70

In the given diagram a line of force originates from charge 9 and terminates at 92 If potential at point 9 a 0 9 0 0 1 2 sin 3 2 2 sin 2 sin 3 2 1 9 0 is zero then

Question No 1 Phy Section A This section contains 35 SINGLE CORRECT TYPE questions Each question has 4 choices 1 2 3 and 4 out of which only one is correct P 1 et where tis time and Pand Q are dimensional constant The dimension of PQ will be The displacement of a particle is given as x O MOLT O MOLT 2 O MLT 2 O M L 2T

A stationary person observes that rain is falling vertically down at 30 km hr A cylist is moving up on an inclined plane making an angle 30 with horizontal at 10 km hr In which direction should the cyclist hold his umbrella to prevent himself from the rain A At an angle tan with inclined plane B At an angle tan C At an angle tan D At an angle tan 1 3 3 5 3 3 5 3 3 7 with horizontal plane with inclined plane with vertical plane

Abhiram leaves his house at 8 30 am for his school The school is 2 km away and classes start at 9 00 a m If he walks at a speed of 3 km hr for the first kilometer at what speed should he walk the second kilometer to reach just in time 4 5 km hr 3 km hr 6 km hr

Neena was cycling to the market to buy some grocery items The market is 4 km away from her home She travels at a speed of 12 km h for first 10 minutes On her way she meets her friend Nikhat and stops to chat with her for 15 minutes She resumes her journey at a speed of 8 km h What is her average speed for the journey O O 10 km h 4 km h 6 km h

A spaceship travelling in space at 300 km s its engine for 15s such that its final velocity is 600 km s The total distance travelled by the ship in one minute starting from the time of firing is O O 27 000 km 43 750 km

A capacitor of capacitance 0 1uF is first charged and then discharged through resistor of 10MQ The time in which charge on capacitor falls to half of its initial value is A 0 69 msec B 0 3 sec C 0 3 msec D 0 69 sec

Two coaxial long cylindrical shells of radii R and 3R are connected across a battery of emf Vo Electric field at point P at a radial distance 2R from axis is Rin 3 2 O V 2RIn3 V 2RIn 2 V Jhy

A 3M resistor and a 1uF capacitor are connected in series with the battery of 4 volts After one second rate at which charge on capacitor increases is given by A 9 5 C sec B 0 95 sec C 0 95 C sec D 9 5C sec

3 At the first minimum adjacent to the centr maximum of a single slit diffraction pattern t phase difference between the Huygen s wave from the edge of the slit and the wavelet from t Re AIPMT 201 mid point of the slit is 1 21 T 8 T radian radian 2 TU 4 radian radian

5 A duster weighs 0 5N It is pressed against a vertical board with a horizontal force of 11N If the co efficient of friction is 0 5 the minimum force that must be applied on the duster parallel to surface to move it upwards

d SolveLancer Test While doing an experiment based on sonometer and AC the maximum value of AC is found to be 11 A and its frequency is 50 Hz What is its average value Starting from zero how long will it take for the current to reach its peak value SolveLancer Test a b c d a b C 7 8 A 200 s 1 7 8 A S 200 1 7 A S 200 14 A 200 s

A short dipole having dipole moment poi is placed at origin Consider the point P 4 3 P Electric field at point Pis Electric field at point P is Po 73 2500 Po 43 2500 Electric potential at point P is zero Electric potential at point P is non zero

6 The co efficient of static kinetic frictions are 0 6 0 3 The minimum force required to start the motion is applied and if it is continued the distance travelled by the body in 4 sec is g 10ms 2 Ans 24 m

The graph show represents variation of temperature of two boc and y having same surface area and same capacity with time t due to the emissi radiation The correct relation between the emi E and absorptive power a of the two bodie T H 1 E E and a a 2 E E and a a 3 Ex E and

Two particles of mass 5 kg and 10 kg respectively are attached to the two ends of a rigid rod of length 1 m with negligible mass The centre of mass of the system from the 5 kg particle is nearly at a distance of Question Type Single Correct Type 1 2 3 80 cm 33 cm 50 cm 67 cm

The current gain of common emitter transistor is 80 Input resistance and input voltage of a commo emitter transistor are 2 k and 0 02 V The collecto current is 0 5 A 800 A 0 05 mA

The charges shown in figure 4m 9 4 c 9 6 c 3m 2pc 1 What is the absolute electric potential for third charge q which is initially at rest is repelled to infinit the combined electric of other two charges which are held fixed 2 What is the final kinetic energy of third charge

https session masteringphysics com myct assignmentPrint View assignmentID 9234534 6 22 2021 HW Ch10 Part A What is the angular acceleration of the propeller Treat the propeller as a slender rod Hint 1 Hint

A thin dielectric rod of length lies along the x axis with one end at origin and other at the point 0 It is uniformly charged with total charge Q If field and potential at point P 21 0 is E and V respectively then DE DE 6 0 Qin2

Approximate 1 using the binomial expans first order in Check your answer by using pla 2 1 and 0 1 into the given equation and your approximation They should be close

Three particles are located at the corners of an equilateral triangle of side a 3 m The particles start moving with a constant speed v 2m s such that the particle initially at A always heads towards the particle initially at B and the particle at B heads for the particle at C and C heads for the particle at A The magnitude of initial acceleration in m s of the particles is

6 Binomial Expansion Approximate 1 using the binomial expans first order in Check your answer by using plu a 1 and 0 1 into the given equation and your approximation They should be close

19 In arrangement shown below the thread pulley and spring are all massless and there is no friction anywhere The system is in equilibrium If thread is cut A acceleration of m 0 By acceleration of m m m3 m4 0 C acceleration of m m m3 0 D acceleration of ma m m m3 m4 g m4 el m K m m K

2 Only 1 mm diameter needles will float 3 Only needles with diameters 1 mm and 2 5 mm will float 4 All needles will sink 23 A boundary separates two media of refractive index 1 and 1 5 as shown A parallel beam of light is incident on the boundary from left and get focussed at 2 0 where axes and origin are mentioned in the diagram pre rom simple p 1 1 Boundary is circular in xy plane 2 Boundary is parabolic in xy plane 1 3 Slope of boundary has a value 4 les will st 4 At origin boundary has a radius Gary 50 1 1 5 at 1 1 units X

Solute molecule Water Apply concept of water potential and osmosis Semi permeable membrane In which direction will osmosis occur 1 From A to B 2 From B to A 3 No net osmosis

A car Pis moving with a speed of 10 m s on a straight road Another car s driver wishes to overtake the car Pin 100 s If second car is I km behind the car P with what constant speed the second car should move

4 Alpha particle A charged particle is whirled in a horizontal circle by attaching it to a string fixed at one point If a magnetic field is switched on in the vertical direction the tension in the string 1 Will increase 2 Will decrease 3 Will remain the same May increase or decrease

i and 3 are unit vectors along the x and y axis respectively What is the magnitude and direction of the vector j 1 2 45 with x axis 2 2 450 with x 4 3 60 with x 1 600 with x axis axis axis

plane requires a speed of 12 kmph for a off with 150m run on the ground The mass the plane is 1500kg and the coefficient of on between the aeroplane and the ground is Assuming that the aeroplane accelerates formly during take off find the minimum force ned by the engine of the aeroplane for take

A convex lens of focal length 40 cm is held co axially 12 cm above a mirror of focal length 18 cm An object held x cm above the lens gives rise to an image coincident with it Then x is equal to 10 a 12 cm X 0 0 1O 15 cm c 18 cm d 30 cm 12 A body of mass 3 kg is under a constant force which causes 0

3 A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature The length of aluminium rod is a 113 9 cm b 88 cm c 68 cm d 6 8 cm

9 A horizontal force of 150N produces on acceleration of 2m s2 in a body placed on a horizontal surface A horizontal force of 200N produces an acceleration of 3m s The mass of the body and coefficient of kinetic friction are g 10ms 2

conducting wire is bent in the form of an equilateral triangle of side 10 cm Current flowing through it is 0 5 A Magnetic moment of current carrying triangular loop is Zero 3x10 A m 3 4 x10 Am Am

Q 34 C is a point midway between A and B The average speed of a person from A to C is V At what speed must he travel the remaining distance to have an average speed of 4 for the whole jour 4V 3 ney 2V of 30 m s and 40 m s when passing two ing of

alvanometer of resistance 50 2 is connected to a series A full scale deflection of 30 divisions is obtained in the galvanometer In order to reduce this deflection to 15 divisions the resistance in series should be Q Guj CET 2015 a 1950 c 2000 Chea b 7900 d 7950 v 2015