Physics Questions

03 In a vernier callipers ten smallest divisions of the vernier scale are equal to nine smallest 10 division on the main scale If the smallest division on the main scale is half millimeter then the vernier constant is A 0 5 mm C 0 05 mm B 0 1 mm D 0 005 mm

Two wires of same material length 2 and area of cross section A and 2A respectively are connected is series to cell The ratio of potential drops across the resistance wires are 24 012 021 04 1 01 4

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

Calculate the active and reactive components of current in each phase of a star connected 10 000 volts 3 phase generator supplying 5 000 kW at a lagging p f of 0 8 Select one a 288 A 216 A b 350A 290A c 410A 370A d 210A 156A

A truck is traveling south at a speed of 53 km h toward an intersection A car is traveling east toward the intersection at a speed of 60 km h What is the velocity of the car relative to the truck A 7 km h B 113 km h C 80 km h D 28 km h

Which of the following statement is true A catalyst alter Gibbs energy of a reaction The action of the catalyst cannot be explaine by intermediate complex theory O A catalyst does not change the equilibrium constant of a reaction O Catalyst catalyses the non spontaneous reaction

shown positi in the figure When switch S is turned to 2 the percentage of its stored energy dissipated is V v 1 20 3 40 1 F 26 4 F 2 80 4 60 ES V 110 F

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

Distance between plates of a parallel plate charged capacitor disconnected from battery is increased The quantity that remains constant is Potential difference between plates Charge Electric field between plates

A capacitor of capacitance 2 mF is charged to a potential of 10 V The capacitor is now connected to an identical capacitor charged to a voltage 20 V such that the plates of same polarity are connected together The loss of energy in redistribution of the charges is 2 8 J 0 5 J 0 05 J 6 6 J

The root mean square velocity of molecules of a gas is 200 m s What will be the root me square velocity of the molecules if the molecular weight is doubled and the absol Cemeprature is halved 100 m s A B 100 m s C 200 m s nce D 50 m s nce

Since diodes are destroyed by circuits must have Select one a higher current sources b more dopants c higher voltage sources O d current limiting resistors O

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

3 Three long coaxial conducting cylindrical shells have radii R 2R and 2 2 R Inner and outer shells are connected to each other The capacitance across middle and outer shells per unit length is 1 3 1 3 0 In 2 TEO 2n2 2 6 In 2 4 E In2 8

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 supply voltage of 230 V 50 Hz is fed to a residential building Write down its equation for instantaneous value Select one a 163 sin 314 16t O b 325 sin 314 16t O c 230 sin 314 16t d 360 sin 314 16t

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

22 Consider the situation as shown in the figure The work done in taking a point charge from point P to A is WA from P to B is WB and from P to C is Wc then q A 1 WA WB Wc 2 WA WB Wc 3 WA WB Wc B C p P JA PIB

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

Three identical coils connected in delta to a 400V 3 phase supply take a total power of 50kW and a line current of 90 A Find phase current and power factor Select one O a 52A 0 80 O b 35A 0 80 O c 40A 0 80 Od 66A 0 90

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 Fill in the blanks 1 The quantities which are unique and do not depend on other quantities are called 2 3 4 5 6 quantities Decametre is of metre kg is equal to 1 tonne of an object can be determined using graph paper clock is used to measure smaller time intervals is used to measure the temperature of an object

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

An object weighs m in liquid of density p and that in a liquid of density P2 weighs m2 The density of object is M P2 M P1 m m M P2 M P1 m m M P2 M P1 M M M P2 M P1 m m

In a potentiometer arrangement of a cell of emf 2 V gives a balance at 40 cm length of wire Now when the cell is replaced by another cell the balance point shift to 60 cm The emf of the second cell will be 22 O 1V O 3 V O 2V O 4 V

A dip circle is oriented with its piane at an angle o 30 with the magnetic meridian at a place The apparent angle of dip shown by the dip circle is 45 The true angle of dip at the place will be 1 tan 1 3 2 3 tan 4 2 tan 2 4 tan 19 2

19 A cylinder is pure rolling up an incline plane It stops momentarily and then rolls back The force of friction 1 on the cylinder is zero throughout the journey 2 is directed opposite to the velocity of the centre of mass throughout the journey 3 is directed up the plane throughout the journey 4 is directed down the plane throughout the iourney

A steel wire of length 4 2 m and cross sectional area 3 x 10 5 m stretches by the same amount as a copper wire of length 3 5 m and cross sectional area 4 105 m under given load What is ratio of Young s modulus of steel to that of copper 05 8

Q Electron in a Magnetic Field An electron of charge 1 6 x 10 19 C and velocity 2 35 x 107 ms moves p pendicularly to a magnetic field with magnetic flux density 3 4 x 10 2T Calculate the size of the force on the electron

1 A man of mass M stands at one end of a plank of length L which lies at rest on a frictionless surface The man walks to other end of the plank If the mass M 3 moves relative to ground is 3L 4 4L of the plank is 4 then the distance that the man 2 4 L

resistance as seen at ab are respectively W 10S2 wwa 552 O10v 102 V Select one a 5V 10 ohm O b 54V 15 ohm O c 10V 10 ohm d 10V 15 ohm 16 10 AKADR ob

A pulley is hinged at the centre and a massless thread is wrapped around it The thread is pulled with a constant force F starting from rest As the time increases F K ABAL 1 its angular velocity increases but force on hinge remains constant 2 its angular velocity remains same but force on hinge increases 3 its angular velocity increases and force on hinge increases 4 its angular velocity remains same and force on

A sinusoidal voltage is represented as v 141 4sin 314 18t 2 Its rms value of voltage and frequency respectively Select one O a 141 42V 314 16Hz O b 100V 100Hz O c 87 92V 56Hz O d 200V 50Hz

optio 1 Which of the following is not a fundamental quantity a Current c Weight 2 A physical balance is used for the measurement of a length c area 3 1 micron is equal to a 10 c 10 6 4 Vernier calliper is used to measure a mass c area 5 Doctor s thermometer is another name for a clinical thermometer c maximum minimum thermometer 6 A kink is present in a clinical thermometer c both a and b metres b Time d Length b d mass volume b 10 d 106 b length d none of these b laboratory thermomete d none of these b laboratory thermometer d none of these

A point source of fight 5 is placed at distance L in front of the centre of plane mirror of width d which is hanging vertically on a wall A man walks in front of the mirror along a line parallel to the mirror at a distance 2L as shown below The distance over which the man can see the image of the light source in the mirror is d ExamSIDE Com L 2 L

resistance 2r is also connected in series with the capacitor The amount of heat liberated ins of capacitance C is charged by a battery of emf E and internal resistance the battery by the time capacitor is 50 charged is 3 a E C 8 E C E C b c 6 12 For the circuit shown in the figure determine the charge on canggit d E C 24

Example 14 In the adjacent figure angle 9 of the inclined plane is adjustable A block is kept on the incline and 9 is increased slowly from 0 and it is observed that block starts sliding down the incline when 9 is just greater than 37 The coefficient of static friction is A 0 5 B C 0 6 0 75 D 1 2 8 5 kg

Water flows through a horizontal pipe of varying cross section at a rate of 0 5 m s1 The speed of water at a point where area of cross section is 500 cm i 10 ms 1 50 ms 1 2 ms1 O 5 ms

3 A wire of length L and 3 identical cells of negligible internal resistances are connected in series Due to the current the temperature of the wire is raised by AT in time t N number of similar cells is now connected in series with a wire of the same material and cross section but of length 2L The temperature of the wire is raised by the same amount AT in the same time t The value of N is A 4 B 6 C 8 D 9 A O B C

Determine the x and y coordinates of the centroid of the shaded area 125 mm O 125 mm Select one a 125 3 mm 70 2 mm O b 132 1 mm 75 8 mm O c 125 3 mm 82 4 mm O d 132 1 mm 67 6 mm 200 mm 200 mm 150 mm 60 mm

In an R C series circuit Xc R then the phase angle between the applied voltage and circuit current is Select one a 90 degree b 30 degree c 45 degree d 36 degree

13 A particle of mass m and charge q is fastened to one end of length 7 The other end of the string is fixed to the point O The whole system lies on a frictionless horizontal plane Initially the mass is at rest at A A uniform electric field in the direction shown is then switched on Then a the speed of the particle when it reaches Bis 29 El m GET b the speed of the particle when it reaches Bis V m the tension in the string when the particle reaches at Bis qE the tension in the string when the particle reaches at Bis zero 60 A

In the diagram shown the charge Q is fixed Another charge 2q and mass m is projected from a distance R from the fixed charge Minimum separation between the two charges if the 1 times of the projected velocity at this moment is Assume gravity to be velocity becomes 3 1957 R b R Q V R 30 c R 2q

The equivalent capacitance of the combination as shown in the figure between point A and Bis 10 F A 20 uF 30 F O 30 F O 20 F O 10 F 20 F 11 40 F B

A spool initially at rest is kept on a frictionless incline making an angle 0 37 with the horizontal The mass of the spool is 2kg and it is pulled by a string as shown with a force of T 10N The string connecting the spool and the pulley is initially horizontal Find the initial acceleration of the spool on the incline Express your answer in m s m T

answered If in an RLC series circuit the frequency is below out of 2 00 resonant frequency g question estion 2 Select one O a Xc XL O b XC XL Oc None of the options O d Xc XL

This section contains 35 SINGLE CORR TYPE questions Each question has 4 Read More f two rods of length L and 2L having coefficient of linear expansion a and 2a respectively are connected end to end The average coefficient of linear expansion of composite rod is O O N W 50

f a metal wire is stretched much beyond its elastic limits yield point and released It will Come back to original length O Loss its elastic property completely Contract only upto its length at elastic limit Contract but final length is more than initial length

A black spot is present at the centre of the face of an equilateral prism A man places his eye directly at the opposite corner He sees two images of the spot at an angular separation of 60 Then the condition on the refractive index of the prism is Black spot Answer Rate this question