Basic Physics Questions and Answers

Joining q7 and 9 Question 17 Find the expression for the equivalent capacitance of three capacitors having respective capacitances C and C3 connected in parallel OR

Give your answer in Joule Question 9 3 The electric field intensity at a point distance 20 cm apart from an infinite line of charge of is 5 N m Find its linear charge density Question 10 Find the expruction 3

The potential on the surface of hollow sphere of radius 2 m is 200 volt The potential at 1 m from the centre of the sphere is O 100 volt O 200 volt O 400 volt View in Zero

The magnitude of electric force experienced by a charged particle in an electric field depends o O Charge of the particle O Velocity of the particle O Direction of electric field O Mass of the particle

A car drives around a circular track of diameter 128 m at a constant speed of 38 1 m s During the time it takes the car to travel 168 degrees around what is the magnitude of the car s average acceleration

An ideal incomplete expansion cycle uses steam generated at 1 85 MPa The release condition is dry and saturated Exhaust steam is at 0 03 MPa and has 10 58 quality The actual engine uses 1000 kg h of steam The brake engine efficiency is 60 and the mechanical efficiency is 85 a For the ideal engine calculate the thermal efficiency and MEP For the actual engine calculate b the brake power in kW and the brake thermal efficiency c the indicated thermal efficiency and the indicated heat rate d the approximate enthalpy of the exhaust steam at 0 03 MPa assuming that the heat loss from the engine is 23 kJ per kg of steam

The reaction time is the time interval in which a person Observes the incident Think about the observations Takes the action

At a certain distance from a point charge in C the electric field is 200 V m and the potential is 800 V What is this distance O 8 m O 4m O 2 m 16 m View in

An electric pump on the ground floor of a building takes 10 minute to fill a tank of 45 m with water The tank is 20 m above the water level If electric power consumed by the pump is 30 kW then efficiency of the pump will be density of water is 1000 kg m 33 75 50

3 A massive sphere is fitted onto a light rod at a distance x from ground end and it is placed vertically Assume the end of rod on the ground does not slip for which of the following values of x the rod will fall faster if A X B x 2 C x 14 D rate of falling of rod is indpendent of x

View in The charge to be put on a spherical conductor of radius 0 2 m to produce an electric field of 0 072 N C just above its surface is O 16 10 14C O 8 10 14C O 32 10 14C

If the electric potential of the inner shell is 10 volt that of the outer shell is 5 volt then the potential at the centre will be the shells are uniformly charged 1 10 volt 3 15 volt 2 5 volt 4 0 a

1 20 0 A log of wood of mass 120 Kg floats in water The weight that can be put on the raft to make it just sink should t density of wood 600 Kg m 180 Kg 2 50 Kg 3 60 Kg 4 30 Kg Acylinder of height 20m is completely filled with water The velocity of efflux of water in ms through a small he

op 400 m s 2 600 m s 3 60 m s 4 An ice berg of density 900 kg m is floating in water of density 1000 Kg m The percentage of volume of ice cube outside the water is 38 30 1 20 2 35 3 10 4 25 A lng of wood of mass 120 Kg floats in water The weight that can be put on the raft to make it just sink should be

1 isochoric process 2 isobaric process The horizontal flow of fluid depends upon 1 pressure difference 2 amount of fluid In steady horizontal flow 3 isothermal process 4 adiabatic process 3 density of fluid 4 all the above

3 in a straight line perpendicular to a stream line 4 for ideal lequid stream line flow on a stream line Bernoulli s equation is based upon 3 isothermal process 4 adiabatic process 1 isochoric process 2 isobaric process The horizontal flow of fluid depends upon

3 horizontally in line with its centre of gravity 4 may be anywhere A cork is suberged in water by a spring attached to the bottom of a bowl When the bowl is kept in an elevator moving with acceleration downwards the length of spring 1 Increases 3 Remains unchanged 2 Decreases 4 None of these

The time dependence of a physical quantity p is given by p po exp at2 where a is constant and t is the time The constant a a is dimensionless b has dimensions T 2 c has dimensions T d has dimensions of p

When a current of 1 ampere is passed in a coil lying in the magnetic meridian then a magnetic needle at its centre gives some deflection If the current in the coil is increased to g ampere then at what distance from the centre of the coil will the deflection of needle remains unchanged 1 2R 2 4R 3 8R 4 R

The Reynolds number of a flow is the ratio of 1 Gravity to viscous force 3 Inertia forces to viscous force 2 Gravity force to pressure force 4 Viscous forces to pressure forces TI

A combination of two simple harmonic motions with arbitrary amplitudes and phases is not necessarily periodic It is periodic only if frequency of one motion is an integral multiple of the other s frequency However a periodic motion can always be expressed as a sum of infinite number of harmonic motions with appropriate amplitudes The period of SHM does not depend on amplitude or energy or the phase constant phite under gravitation Kepler s third

a Soft iron is a conductor of electricity b It is a magnetic material c It is an alloy of iron d It is used for making permanent magents State whether 1 a and c are true 2 a and b are true 3 c and d are true 4 b and d are

A siphon in use is demonstrated in the following figure The density of the liquid flowing in siphon is 1 5 gmvcc The pressure difference between the point P and S will be 1105 NIG 10 cm S R 20 cm

A body is just floating on the surface of a liquid The density of the body is same as that of the liquid The body slightly pushed down What will happen to the body 1 It will slowly come back to its earlier position position 2 It will remain submerged where it is left 3 It will sink 4 It will come out violently of the body is same as that of the liquid The bod

A fire hose can expel water at a rate of 9 5 kg s 150 gallons minute with a speed of 24 m s How much force must the firefighters exert on the hose in order to hold it steady 0 23 KN O 0 5 KN 1 5 kN 1 2 KN

In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude if the angle between this force and the vertical is decreased the frictional force between the surface and the body will 1 increase 2 decrease 3 remain the same 4 may increase or decrease A 40 kg slah rests on a frictionless floor A 10 kg block rests on top of the slab The static coefficient of friction

gu A block of mass m is in contact with the cart C as shown in the figure The coeff tion between the block and the cart is u The acceleration a of the cart that will prevent the block from AIPMT 2010 falling satisfies mg 5 0 g a 3 B m 4 a 201 g

PCP 3 x 1 A block of mass m is placed on a surface with a vertical cross section given by y 6 0 5 the maximum height above the ground at which the block can be placed without slipping is 3 1 8 m 2 m m 4 2 If the coefficient of friction is

12 Three identical particles each of mass m are placed at the corners of an equilateral triangle of side l The work done by external force to increase the sides of triangle from to 2l is 1 3 3GM l 3GM 2 3 3GM 2l 3GM

Three concentric metallic spherical shells of radii R 2R 3R are given charges Q1 Q2 Q3 respectively It is found that the surface charge den sities on the outer surfaces of the shells are equal Then the ratio of the charges given to the shells Q Q2 Q3 is a 1 3 5 b 1 2 3 c 1 4 9 d 1 8 18

b What are the advantages of Newton s divided interpolation formula over the Langrage s formula The strength of concrete block at different time is shown in the table Calculate strength when t 28 day Days Strength ksi 3 0 5 7 1 3 14 1 8 20 2 5

Which of the following sets of vectors given below may have zerc resultant 12 14 28 14 18 36 O 11 22 17

81 Two waves of wavelengths and 2 A2 produce 6 beats sa 51 per second If M 9 find the speed of sound wave 2 in a gas in which these waves produce beats a 316 m s b 310 m s c 306 m s d 326 m s

Estimate how long it might take for ethyl alcohol to be detected 6 cm from a bottle after it opened assuming only diffusion is occurring Assume the diffusion constant is 10 5 m 2 s Select one 45 s O 3 min 4 5 s O 0 18 s

9 3 Two cylinders A and B fitted with pistons contain equal amounts of an ideal diatomic gas at 300 K Piston A is free to move and piston of B is fixed Same amount of heat is given to the gases in the two cylinders Temperature of the gas in cylinder A increases by 30 K Then increase in temperature of the gas in the cylinder B is y 14 for diatomic gas a 24 K b 36 K c 54 K e 9210 EAMCET 2013 d 42 K

hich vector sum is equal to the vector A in the diagram IF B A C D B C D E C C F P B C D KAI C

Problem 3 Consider a trough of a semicircular cross section and an inclined plane in it that leads from a point A to point B lying lower than A Prove that wherever point C is chosen on the arc AB an object will always get from A to B faster along the slopes ACB than along the original slope AB The change of direction at C does not involve a change in speed The effects of friction are negligible Problem The

A block of mass m is suspended from a spring Its frequency of oscillation is f The spring is cut into two identical halves and the same block is suspended from one of the two pieces of the spring such that it just touches the other spring below in its equilibrium position The frequency of small oscillations of the mass will be A E 56 elle 0 35 D Os 56

1 Calculate the mass of ascorbic acid Vitamin C CH O to be dissolved in 75 g of acetic acid to lower its melting point by 1 5 C K 3 9 K kg mol motic pressure in pascals exerted by a solution prepared

26 The plot of velocity v versus displacement x of a particle executing simple harmonic motion is shown in figure The time period of oscillation of particle is 10 v m s 0 4 0 10 x cm 2 Is

A ball is dropped from the top of a tower After 2s another ball is thrown vertically downwards with speed of 40 ms After how much time and at what distance below the top of tower the balls meet a 30 m c 40 m b 37m d 45 m

4 The increase in internal energy of 1kg of water at 100 C when it is converted into steam at the same temperature and at 1 atmospheric pressure will be density of steam is 0 6 kg m latent heat of vaporisation of water 2 25 106 Jkg 3 9 X a 1 04 106 J c 4 16 106 J UK PMT 201 DQ ML b 2 08 x 106 J d 8 32 x 106J

Wave Optics Questions with Answer Keys math The speed of electrons in a scanning electron microscope is 1 107 ms 1 If the protons having the same speed are used instead of electrons then the resolving power of scanning proton microscope will be changed by a factor of outhongs mathongamathongs mathongo mathongo mathongo mathongs mathongo 1 1837 JEE Main 2021 2019 Chapter wise MathonGo mathongo mothongs

0 At the first minimum adjacent to the central maximum of a single slit diffraction pattern the phase difference between the Huygen s wavelet from the edge of the slit and the wavelet from the midpoint of the slit is T a radian 4 T b radian 2 c radian I d radian

Question 22 20V M M 4 00 In the given circuit the value of R so that thermal power generated in R will be maximum in Q2 1092 www 30V 1002 492 www R N M 0 00 www 1202 40V www 3002 60V

2 Natural frequency of body 3 Difference of frequency of driving and natural frequency 4 Mean of driving force and natural frequency 18 Which of the following equation represents damped oscillation 1 3 dx dt dt kx dx dt 0 2 4 dx2 dt kx fo sin co d x dx dt k m x 0

The mean weight of 150 students in a certain class is 60 kilograms The mean weight of boys in the class is 70 kilogram and that of the girls is 55 kilograms Find the number of boys and number of girls in the class

lucting shells A and B of radil r and 2r respectively They are given charge Q and 2Q respectively as shown A 3 Q 2Q After the switch is closed what is the charge on inner surface of shell B 1 Zero B 2 Q 4 3Q 2 Medic

Q 8 a c A stone thrown from the top of a building is given an initial velocity of 20 0 m s straight upward Determine the time in seconds at which the stone returns to the height from which it was thrown g 9 8m sec 4 08 4 44 b d 3 45 5 32

Two metal plates form a parallel plate capacitor of capacitance C The distance between the plates is d A metal sheet of thickness d 2 and of the same area is introduced between the plates and capacitance becomes C The ratio of C and C is af 2 1 1 2 b d 3 1 5 1