Basic Physics Questions and Answers

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

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

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

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

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

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

Given Potential difference V 8 0 5 V and current I 2 0 2 A The value of resistance R in Q is Question Type Single Correct Type 1 2 3 4 4 16 25 4 6 25 4 10 4 8

For two resestors R and R connected in parallel if R 30 1 2 and R 60 2 2 The percentage error in the measurement of equivalent resistance is 1 3 33 3 6 67 2 33 3 4 9 that is true

A proton a deutron and an x particle accelerated through the same potential difference enter a region of uniform magnetic field moving at right angles to it What is the ratio of their kinetic energy 1 1 1 2 2 2 2 1 3 1 2 1 1 C A

A bar magnet and a wooden bar identical in dimension and mass are released from same height to fall under gra passing through multiple rings of conducting material Time taken by bar magnet is T and by wooden bar is T T which is possible out of given options T T T T T T None of these

2 An electron is 2000 times lighter than a proton Both are moving such that their matter waves have a length of 1 The ratio of their kinetic energy in approximation is A 1 1 B 1 2000 D 1 200 C 2000 1

A tunnel is dug along a chord of earth having length 3R where R is radius of Earth A small block is released in the tunnel from the surface of Earth The particle comes to rest at the centre of tunnel Find coefficient of friction between the block and the surface of tunnel Ignore the effect of rotation of Earth 3 1 74

Zero Marks In all othe 300 identical galvanic cells each of internal resistance 90 are arranged as several in series groups of cells connected in parallel The arrangement has been laid out so that power output in an externally connected resistance of value 160 is maximum If n number of cells are connected in every series group that form parallel combination then find value of n HF 1 E E I E n 4 wwwwww R 16

A parallel plate capacitor with circular plates of radius R is being charged with a current as shown in the figure At R and R is given by instant shown the displacement current between the places enclosed between T O O i 15 16

1 Two protons each having kinetic energy K move towards each other from infinitely large separation Assuming a proton to be a sphere having radius equal to 1 fermi the minimum value of K for which the protons are able to touch each other is 1 360 keV 2 180 keV 3 720 keV 4 1440 keV

A solenoid has an inductance of 10 henry and a resistance of 2 Q It is connected to a 10 V battery Time taken for t magnetic energy to reach 1 4 th of its maximum value is approximately C 2s 8s 3 5 s 2 5 s

Two wires are of same length and same area of cross section If first wire has resistivity p and temperature coefficient of resistance a but second wire has resistivity p and temperature coefficient of resistance a Their series equivalent resistance is independent of small temperature changes Then a a 0

120 The number N of scattered a par versus scattering angle 0 graph for a particle scattering experiment obtained by Geiger and Marsden is best represented by NA 1 3 V NA 2 4 V NA

A ballon start rising from the surface of the earth The ascent rate is constant and is equal to vo Due to the wind the balloon gathered the horizontal velocity component V ay where a is constant and y is the height of ascent Find the horizontal drift of the ballon x y

9 Which of the following graphs may represent 125 the relation between the capillary rise h and the radius r of the capillary h d W b a C A a B b r C C D d 12

Question No In a bar magnet angle between the magnetic axis and magnetic moment is choose the best possible answ OO 0 60 90 120

06 The maximum and minimum magnitudes of the resultant of two given vectors are 17 and 7 respectively If these two vectors are at right angles to each other the magnitude of their resultant is A 6 C 11 B 19 D 13

128 The angle of dip at a place is 60 At this place the total intensity of earth s magnetic field is 0 64 units The horizontal intensity of earth s magnetic field at this place is A 1 28 units B 0 64 units C 0 16 units D 0 32 units

A parallel piate capacitor is filled with two dielectrics as shown in the diagram The area c plates is A and the distance between the plates is d If the thickness of each dielectric slab is d 2 and the dielectric constants are K and K then the net capacitance is K K 2 A K K d K K O BAK K d EoA K K 2d 2 A d

24 A convex a concave lens are brought in close contact along their optical axes The focal length of the convex lens is 10 cm When the system is placed at 40 cm from an object a sharp image of the object is formed on a screen on the other side of the system Determine the optical power of the concave lens if the distance between the object the screen is 1 6 m A 6 7 D C 7 0 D B 6 7 D D 7 0 D

124 A convex a concave lens are brought in close contact along their optical axes The focal length of the convex lens is 10 cm When the system is placed at 40 cm from an object a sharp image of the object is formed on a screen on the other side of the system Determine the optical power of the concave lens if the distance between the object the screen is 1 6 m A 6 7 D C ZOD B 6 7 D D 70D

A current of 5A exists in a 10 resistance for 4 minutes The number of electrons and charge in coulombs passing through any section of the resistor in this time are A 75 x 1020 600C B 75 x 102 600C C 75 x 1020 1200C D 75 x 10 9 1200C

A potentiometer wire AB is 100 cm long and has a total resistance of 10 ohm If the galvanometer shows zero deflection at the position C then find the value of unknown resistance R A 40 cm 5V r 122 HEM 10V A 20 C 622 HC R im G B B 42 D 822

What is the capacitance of the capacitor of square plates of area A Shown in figure P K A B Q E A K K 4d K K Eo A K K K 3K K d Eo A K K 3K K K C 4d Eo A d

In a certain double slit experimental arrangement interference fringes of width 1 0 mm each are observed when light of wavelength 5000 is used Keeping the set up unaltered if the source is replaced by another of wavelength 6000 the fringe width will be A 0 5 mm C 1 2 mm B 1 00 mm D 1 5 mm

A black body radiates maximum energy at wavelength A and its emissive power is E Now due to change in temperature of that body it radiates maximum energy at wavelength At that temperature emissive power is A B C 27E 16 81E 16 91E 16

130 A block of mass M is allowed to slide down a fixed smooth inclined plane of angle 8 and length What is the power developed by the force of gravity when the block reaches the bottom A 2m gsin0 B 2 3 m3 lg2 sin 0 C 2 3 m t gcos 0 D 1 3 m g 2 sin A

A car is moving with a velocity of 157 7 5 m s and a biker is moving with a velocity of 12 4 5 m s Find the velocity of the car relative to the biker in m s C 3i 12 j D 3i 12 j

105 Two waves are represented by Y a cos t kx and y a2 sin ot kx 1 3 Then the phase difference between them is B 7 7 2 A 3 C 5t D 6

17 A charge Q is uniformly distributed over the surface of two concentric conducting spheres of radii R and r R r Such that surface charge densities are same for both spheres Then potential at common centre of these spheres A kQ R r Rr kQ 2 2 C T2 kQ R r B R r 1 D KQ R

08 Temperature of a diatomic gas is 300 K I moment of inertia of its molecules is 8 28 10 38 gm cm root mean square angular velocity is A 10 2 rad s B 10 108 rad s C 1 5 10 2 rad s D 15 x 108 rad s

4 A force exerts an impulse I on a particle changing its speed from u to 2u The applied force and the initial velocity are oppositely directed along the same line The work done by the force is 3 A Iu 2 C Iu B Iu D 2 Iu

A hollow cylinder having infinite length and carrying uniform current per unit length 2 along the circumference shown Magnetic field inside the cylinder is 1 lool A Hod 2 C 2 B D none of these 95 S

00 A Carnot engine whose sink is at 300 K has an efficiency of 40 By how much the source temperature should be changed so as to increase the efficiency to 60 A 250K increase B 250 K decrease C 325K increase D 325 K decrease

For measuring potentiometer because voltage of any circuit is preferred to voltmeter The potentiometer is cheap and easy to handle Calibration in the voltmeter is sometimes wrong The potentiometer draws no current during measurement Range of the voltmeter is not as wide as that of the potentiometer

2 Consider the cyclic process ABCA on a sample of 2 0 mol of an ideal gas as shown in fig The temperature of the gas at A and B are 300K and 500K respectively A total of 1200 J heat is with drawn from the sample in the process Find the work done by the gas in part BC Take R 8 3 J mol K P C A A 3000 J C 4520 J V B B 3000 J D 4500 J 1

If n 1 then the dependence of frequency of a photon emitted as a result of transition of electron from nth orbit to n 1 th orbit on n will be A u x C u x 1 n me B u x D u x

A spherical ball of radius R is floating at the interface of two liquids with densities p and 2p The volume of the ball immersed in the two liquids are equal Answer the following questions Neglect atmospheric pressure H 2H 2p The force exerted by the liquid of density 2p on the ball is A R pg H 4 B R pg C R pg 2R PB H R D 2nR pg H 3

When an object floating in a liquid is in stable equilibrium then its centre of Duoyancy should be Horizontally in line with its centre of gravity O Vertically below its centre of gravity Vertically above its centre of gravity

An electric dipole placed in a uniform electric field of magnitude 2 N C experiences a maximum torque of magnitude 5 10 N m If the charges of the dipole have a magnitude of 2 mC then the length of the dipole is 2 m 6 m 2 5 m 1 25 m

The axle of a uniform cylinder of mass m and radius R is connected to a spring of spring constant k as given A horizontal uniform board of mass m rests on cylinder and surface If amplitude of oscillation of centre of cylinder is A the maximum value of friction force between cylinder and board is there is no slipping between the cylinder and the board sufficient friction exists between cylinder and ground to prevent slipping m Smooth surface Ak 11 4kA 11 3kA 11 m k 10000

A conical container height h Radius of base R a spherical container Radius 3R and a cylindrical container height h Radius of base 2R each contain a charge Q inside them The ratio of respective electric flux through the containers will be All containers are closed 1 2 3 1 1 1 3 2 1 6 3 2

monoatomic gas of pressure P having volume V expands isothermally to a volume 2 ad then adiabatically to a volume 16V The final pressure of the gas is atio of specific heat P 16 m P1100 B C Paket Carc 32 D Paverlier 64

A steel rod of length 1 0 m area of cross section 1 cm is clamped between tw rigid support The tension developed in the rod on cooling the rod from 220 C t 20 C is Ys 2 x 1011 N m and as 10 5 C O 4 104 N O 2 104 N 0 6 104 N

A wire carrying current i is kept in x y plane 2 X along the curve y Asin A uniform magnetic field B exists in the Z direction The magnitude of magnetic force on the portion of the wire between x 0 and x is 2 1 2Bix 2 Bin 3