Basic Physics Questions and Answers

If resultant of A and B makes angle 90 with B then choose the correct statement s A Angle between A and B is obtuse angle B A B A B C Angle between A B and A is acute angle D A B A B

What is the net force on the rectangular coil 2 A 1 A 2 cm 10 cm Question Type Single Correct Type 125 x 10 7N towards wire 15 cm 2 25 x 10 7N away from wire 3 35 x 10 7N towards wire

When the switch is open in lowermost loop secondary circuit of a potentiometer the balance point length is 60 cm When the switch is closed with a known resistance c R 4 ohm the balance point length decreases to 40 cm Find the internal resistance of the unknown battery 040 020 030 060

Smooth identical logs are piled in a stake truck The truck is forced off the highway and comes to on an even keel lengthwise but with the end at an angle 0 with the horizontal as shown in figure As the truck is unloaded removal of the log shown dotted leaves the remaining three in a condition where they are just ready to slide that is if 0 were any smaller the logs would fall down Find 0 O 0 tan 0 tan 1 0 tan 1 0 tan 1 2 3 1 3 3 1 4 3 1 5 3

b ectrons The number of electrons ejected is proportional to the intensity or brightness etal but do not depend upon the frequency of light Number of electrons ejected Energy threshold Higher intensity light Lower intensity light Frequency work function w of the metal whose threshold frequency v is 5 2 x 1014 s requency of metal vo 5 2 x 1014 S 1

Mass m shown in figure is in equilibrium If it is displaced by x and released find its acceleration just after it is released Take pulleys to be light smooth and strings light O 4kx 5m O 2kx 5m O 4kx m None of these m

A block of mass 1 kg is placed on a smooth horizontal surface Two forces F 20 N and F 10 N start acting on the block in opposite directions as shown in the figure If block get displaced by 10 m in the direction of net force then work done by F will be F F OPTIONS CLEAR SELECTION MARK FOR REVIEW

32 Two concentric spherical conducting shells of radii r and R r R carry charges q and Q respectively The two shells are now connected by a conducting wire The final charge on the inner shell is 1 Zero 3 Q q r R 2 4 Q q r R qr R

A small sphere with radius r and density p falls at a speed v through a fluid of density and coefficient of viscosity n The dimensions of n are ML T 1 If the friction force F opposing the motion is proportional to V it could also be proportional to Select an answer A B C but independent of r nr but independent of p np but independent of p

The radical Correct Answer 2 our Answer 1 CH is aromatic because it has 6p orbitals and 7 unpaired electrons 6p orbitals and 6 unpaired electrons 7p orbitals and 6 unpaired electrons 7p orbitals and 7 unpaired electrons

During inelastic collision OPTIONS CLEAR SELECTION OA O B MARK FOR REVIEW Law of conservation of momentum is valid Law of conservation of kinetic energy is valid C Both 1 and 2

A bike is initially moving at 14 m s in a straight line It then accelerates uniformly in the same direction for one fourth of a second to a velocity of 18 m s How much distance does the bike cover 2 21 pm

5 26 27 28 29 30 31 32 33 34 35 1 1 5 f R 10 cm What is focal length of this curved surface Question Type Single Correct Type 1 10 cm 2 5 cm 3 20 cm 4 30 cm

O 1 oersted 80 A M 13 O 1 oersted 8 A M Jam 80 YER FACR 133 8ufer face O 1 oersted 0 8 A M 133 0 8ufer face O 1 oersted 0 08A M

An electron of mass m when accelerated through a potential difference V has de Broglie wave length The de Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be Question Type Single Correct Type 1 EE m M m 2 VM

Consider an expanding sphere of instantaneous radius R whose total mass remains constant The expansion is such that the instantaneous density p remains uniform throughout the volume The rate of fractiona change in density proportional to A R 1 dp p dt is constant The velocity v of any point on the surface of the expanding sphere is JEE Adv 2017 Paper 2 B R D R2 3

if fay Ayfala THAY Options Ba 3 a OB a B a Ba a R2 6 a

The wave function in S l units for an electromagnetic wave is given as x t 10 sin 3 x 106x 9 x 10 4t The speed of the wave is Question Type Single Correct Type 1 9 10 4 m s 2 3 108 m s 3 3 x 106 m s 7

The energy of ground state of hydrogen atom is 13 6eV In this state the kinetic energy of electron will b of Auf 13 6eV Options O 13 6 eV O 13 6eV O 27 2eV

If r and r2 are the radii of the atomic nuclei of mass number 64 and 125 respectively then the ratio r r is Question Type Single Correct Type 1 2 3 64 125 5 4 64 125

A polariser is used to Question Type Single Correct Type 1 Reduce intensity of light 2 Produce polarised light 3 Increase intensity of light 4 Produce unpolarised light

A compound microscope has magnifying power of 100 when image is formed at infinity The objective has focal length of 0 5 cm and length of tube is 6 5 cm What is the focal length of eyepiece O 2 cm O 2 5 cm 03 cm O4 cm

An inductor of inductance 20 mH is connected across a charged capacitor of capacitance 5 F resulting L C circuit is set oscillating at its natural frequency The maximum charge q is 200 C on the capacitor Find the potential difference across the inductor when the charge is 100 C

A bike moving ahead on a straight highway passes a shop with a constant velocity of 18 m s After 5 seconds it begins accelerating uniformly 20 seconds after passing the shop the bike s velocity is 63 m s Find the bike s speed 14 seconds after passing the shop

A load resistance of 3 kQ is connected in the collector circuit of an amplifier using common emitter configuration with B 50 and input resistance 5000 If the input current is changed by 40 A then by what amount does the output voltage change Question Type Single Correct Type 1 3 V 2 4 5 V 3 3 6 V

The equation of motion of a particle is x a cos a t The motion is b periodic and oscillatory d neither periodic nor oscillatory a periodic but not oscillatory c oscillatory but not periodic

Q2 Two balls of same mass and carrying equal charge are hung from a fixed support of length 1 At electrostatic equilibrium assuming that angles made by each thread is small the separation x between the balls is proportional to Online April 9 2013 a 1 b 1 c 1 3 d 1 3

01 02 03 04 05 06 07 08 09 10 1 When a man stands on a turn table stretching with two equal loads in hand and rotates Then he folds his arm Which of the following statement is correct Question Type Single Correct Type 1 Linear montentum is conserved 2 Time period increases 3 Angular momentum increases 4 Angular velocity increases

4 1 English A monoatomic gas Y 5 3 is suddenly compressed to 1 8 its volume adiabatically then the pressure of the gas will change to Question Type Single Correct Type 1 24 5 2 8 3 40 3 Review Q

1 A block A has a velocity of 0 6 ms to the right Determine the velocity of cylinder B A 1 1 2 ms 3 1 8 ms 2 2 4 ms 4 3 6 ms B

1 20 A car moving with a velocity of 72 KMPH stops engine just before ascending an inclined road If 25 of energy is wasted in overcoming friction the car rises to a height of g 10ms 1 6m 2 7 5 m 3 12 m 4 15 m

between slab and block F F ma restoring friction mgx kx 0 Xo So amplitude A istration 18 max mg k m voorrrrrrrrr M Illustration 17 Ablock of mass m is attached from a spring of spring constant k and dropped from its natural length Find th amplitude of S H M Colution Let amplitude of S H M be A then by work energy theorem W AKE 2mg k umga Sug Aug 03 max ug A Eeeee x 0 v 0 m wwwwwww 3eeeeee X X V 0 m

Three blocks are initially at rest on a smooth floor as shown Then two forces 20 N and 8 N act on the blocks as shown Find the force exerted by 2 kg block on the 6 kg block 20 N 2 kg B 252 N C 15 N D 12 N 6 kg 3 kg 8N

0 A particle is subjected to two mutually perpendicular simple harmonic motions such that its x and y coordinates are given T by x 2 sin oot y 2 sin oot 4 The path of the particle will be a a straight line c an ellipse CBSE AIPMT 1994 b a circle d a parabola

A convex lens A of focal length 40 cm and a concave lens B of focal length 20 cm are placed co axially with a separation of 20 cm between them B being to the right of A An object is placed at a distance of 80 cm to the left of lens A Distance of its final image is at a distance from lens B of 20 cm 15 cm O 17 5 cm 22 5 cm

The velocity of a bird in downward direction with respect to surface water and air is 3 m s What is the velocity of bird as seen by a stationary fish vertically below the bird inside water in m s 4

In Young s double slit experiment how many maximas can be obtained on screen on both sides of central maxima including central maxima if wavelength of monochromatic light is 3500 and slit separation is 8000 A 6 3 05 04

Consider the following compounds CH3 H I I CH3 H CH3 OH HO H OH O H CH3 1 11 Select the correct statement H O 1 and II are enantiomer O 1 and III are identical OH O II and III are enantiomer II and III are identical HO H CH3 CH3 III OH

The static friction between an object in cont act with a surface when it just starting to sli p over the surface is 5N Then the value of i ts limiting friction and sliding friction is appr oximately A 8N 6N B 8N 3N C 3N 6N D 8N 8N

12kg 12 2m s 8kg A body of mass 8 kg is hanging from another body of mass 12 kg Combination is being pulled by a force F with an acceleration of 2 2 m s Then Fis 1 200 N 220 N 3 240 N 152 N 2 4

A charged region of constant magnetic field as shown in diagram Given d In every region magnitude of magnetic field is B X 1 X B B X X X X X X X X q v m x X X TUM X 2km qB X mv 2qB X X X X X X X X X inward O outward B B X X X 42 X X X X X d Choose the correct answer 1 Total time spent by the charged particle in magnetic field is X X X d dd 2m 3qB 4 km

What are the final products of the following sequence ofreactions CH CH CH CH Anhy AICI 0 130 C H Catalyst a Cumene and phenol b Phenol and acetone c Cumene and acetone d Benzoic acid and ethane

An object is placed 1 5 m in front of the curved surface of a plano convex lens whose flat surface is silvered A real image is formed at x m in front of the lens The focal length of lens is 2 m Then x is 3m O 1 5 m 2 5 m 3 5 m

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 unifrom and constant horizontal magnetic field of induction B The maximum force exerted by the track on the sphere is 1 Question Type Single Correct Type 2 m mg BO 3mg qB 2gR

A gas bell is submerged in liquid water with its mass counterbalanced with rope pulleys as shown in Fig 3 20 The pressure inside is measured carefully to be 105 kPa and and the temperature is 21 C A volume increase is measured to be 0 75 m over a of 185 s What is the volume flow rate and the mass flow rate of the flow into the bell period assuming it is carbon dioxide gas CO M mc0 FIGURE

Q mm O Two identical spheres A and B of radius R are separated by large distance Initially charge on A is Q and B is uncharged The switch s is closed at t 0 and current starts flowing through inductor L K is Coulomb s constant L Energy stored in inductor when charges on A and B are same

A spherical capacitor consists of a spherical shell of radius b This is concentric with a smaller conducting sphere of radius a a b charge is induced If charge given to inner sphere is Q then energy of system is U Now if Q charge is given to outer sphere also energy of system is U What will be potential energy of system if Q charge is given to outer sphere only i e charge on inner sphere is zero 11 U U 2 U U 3 11 4 16

Suppose that a 100 Watt beam of light is incident upon a metal surface If the light has a wavelength 200 nm how many photons strike the surface every second Hint Using the power of the beam find how much energy is incident upon the surface every second

constrained to move in a smooth circular slot of radius r in x y plane as shown in the figure The space is gravity free and the particle is initially at rest at 0 r Inner and outer surfaces of the slot are marked 1 and 2 respectively in the figure Let N and N represent normal reaction by surfaces 1 and 2 respectively on the particle Choose the correct answer 1 If a uniform magnetic field of strength B is applied along ve z direction and particle is imparted velocity v qBr in positive x direction 1 N 0 N 0 X qvB 2 N N 2 qVB 2 3 N qvB N O n

The value of de Broglie wavelength of an electron moving with a speed of 6 6 105 ms is approximately 1 Question Type Single Correct Type 1 2 3 11 111 211