Physics Questions

A large vessel of height H is filled with a liquid of density p upto the brim A small hole of radius A is made at the side vertical face close to the base The horizontal force is required to stop the gushing of liquid is 1 2 pgH 3 pgHar m 2 pgH 4 come

The resistance of an average adult human body is 300 2 Find the charge that will flow through a man s body in 5 seconds if he touches a 220V wire with his hand when his feet are touching the ground

cm 3 6 cm 4 8 cm The pressure at the bottom of a water tank is 4 P where P is atmospheric pressure If water is drawn out till the water level decreases by th then 3 pressure at the bottom of the tank is 21 3 P 8 11P 2 7 P 6 9 P

The difference between the apparent frequency of a source of sound as perceived by an observer during its approach and recession is 2 of the natural frequency of the source If the velocity of sound in air is 300 m sec the velocity of the source is It is given that velocity of source velocity of sound 1 6 m sec 2 3 m sec 3 1 5 m sec 4 12 m sec

a circular disc of radius a has been cut out symmetrically from a uniform squar e plate of side 4a Find out the centre of mass of the given plate

3 A tank is filled with water to a height H A hole is made in one of the walls at a depth D below the water surface The distance x from the foot of the wall at which the stream of water coming out of the tank strikes the ground is given by 1 x 2 D H D 2 x 2 g 2 3 x 2 D H D 2 4 None of these 1 2 3 4 38 The with

REVIEW EXERCISES 1 43 Define point defects in solids 1 44 What is Schottky defect 1 45 What is the effect of the presence of Schottky defects on the density of a crystal 46 What are interstitials in a crystal 1 47 Pure silicon does not conduct electricity How can it be made a conductor of electricity Explain with examples

The angular width of c ntral maxima in Fraunhoffer diffraction with the light of wavelength 6000 and slit width 12 x 10 5 cm is O 2 rad O 3 rad O 1 rad O 8 rad

In YDSE the distance between slits is 0 28 mm and distance between slits and screen is 1 4 m Distance between central bright fringe and third bright fringe is 0 9 cm The wavelength of the light is O 5000 O 6000 O 7000 14 16 15 PEIGNE O 9000 LE TE ENTERRA 15 A OLE 43 Sos 1644 1 PARLERAI TALOD NE

49 A massless inextensible string in the form of a loop is placed on a horizontal film of soap solution of surface tension T If film is pierced inside the loop and it convert into a circular loop of diameter d then the tension produced in string is 1 Td 2 Td 3 nd T

The equivalent inductance of two inducto 2 4 H when connected in parallel and 10H connected in series What is the valu inductances of the individual inductors 1 8H 2H 2 6H 4H 3 5H 5H 4 7H 3H New

al bed 3 Energy is neither liberated nor absorbed 4 Some mass is converted into energy 41 The radius of a soap bubble is r The surface tension of soap solution is S Keeping temperature constant the radius of the soap bubble is doubled The energy necessary for this will be 1 24 S 3 16 S 2 8 r S 4 12 S

In Davisson Germer experiment the maximum intensity is observed at Scattering angle 50 and 54 volt Scattering angle 54 and 50 volt Scattering angle 50 and 50 volt O None of these

Two dipoles with dipole moment p 5x 10 KC m and p 9x10 KC m are located at points 0 0 2 m and 0 0 3 m respectively If ele field magnitude at origin is V m then find the value of N 4

When current changes from 2 A to 2 A in 0 05 s an emf of 8 V is induced in a coil Co efficient of self induction of coil is 1 0 2 H 3 0 8 H NG 2 0 4 H 4 0 1 H

O No 24 A thin metal shell enclosed by concentric thick hollow metal sphere then potential at point P is 20 1 2 3 KQ C KQ a KQ C zoro KQ KQ 2KQ

If the nucleus 4X has a radius of about 3 6 fm then 125 would have the radius as A 27 3 6 fm 6 0 fm 4 8 fm 7 2 fm A Y

Water flows in a stream line manner through a capillary tube of radius a The pressure difference being P and the rate of flow is Q If the radius is reduced to and the pressure is increased to 4P then the rate of flow becomes 1 4Q 3 Q 2 1 2 20 NO 15 16

If TA is mean life of a sample A and is the mean life of sample B From the plot shown which of the following is correct dN dt TA TB TA TB TA TB A B t

A spectral line A 5000 in the line coming from distant star is observed as 5010 The receding velocity of the star is O 1 2 x 107 cm s O 6 x 105 m s O 1 2 x 107 km s O 6 km s

28 A spherical ball is dropped in a long column of viscous liquid The speed v of the ball varies as function of time as 3 3 0 0 4 0 0

The maximum intensity of fringes in young s double slit experiment is If one of slit is closed the intensity of that point becomes lo The correct relation is 0 1 10 O 1 2 O 1 4 O There is no relation between and

09 A massive bead is threaded on a light rod that is pivoted to a fixed point O at one end Initially the rod is held in a horizontal position and the bead is at a distance from the pivoted end When the rod is released it rotates in a vertical plane and the bead slides down the rod due to gravity Which of the following statements best suits for dependence of the angle 9 that the rod makes with the horizontal on time t A If coefficient of friction between the rod and the bead is negligible 0 tan B If coefficient of friction between the rod and the bead is finite 0 tangt 2 C If coefficient of friction between the rod and the bead is finite 0 tan D None of the above statements is true 2 gt 21

A single slit of width 0 20 mm is illuminated with the light of wavelength 500 nm The screen is placed 80 cm from the slit The width of the central bright fringe will be 0 1 mm 0 2 mm O 4mm O 5mm

Monochromatic green light of wavelength 5 x 10 7 m illuminates a pair of slits 1 mm apart The separation between consecutive bright fringes on the interference pattern formed on a screen 2 m away is 0 0 25 mm O 0 1 mm O 1 0 mm O 0 01 mm

26 on the two sides of light string mA 8 Kg ms 10 Kg g 10m s A B 1 If monkey A holds the string tightly B goes down with acceleration 2 m s relative to the string then monkey A feels greater than true weight of his own body 2 If monkey A holds string tightly B goes down with acceleration 2 m s relative string then tension in string is 60N 3 If A holds string tightly and B goes down with acceleration 4 m s relative to string then A feels tr weight of his own body 4 If a holds string tightly B goes down with acceleration 4 m s2 relative to string then both A feels weight equals to 640 9 N 2

a circle of radius r due to their mutual gravitational Two particles of equal mass m are moving round interaction The speed of each particle will be 1 2 3 GM with GM V 4r

31 A liquid flows in the tube from left to right as shown in figure A and A are the cross sections of the portions of the tube as shown The ratio of speed will be V V 1 3 A A A 2 4 A V P A A

The activity of a sample is measured as No counts per minute at t 0 and No e counts at t 10 minutes The time in minutes at which the activity reduces to half its value is 5log 0 2 5log 2

4 All of these The terminal velocity of a small sized spherical body of radius r falling vertically in a viscous liquid is given by the proportionality 1 v 2 V

5 A disc of mass 1 Kg lies on a smooth horizontal table A light string runs half way around it as shown in figure One end of string is attached to a particle of mass 0 5 Kg other end being pulled with a force F There is no friction between the disc and the string The acceleration of end of the string to which force is being applied is 1 24 m s 2 32 m s 1kg m 0 5kg F 4N 3 8 m s 4 16 m s

The de Broglie wavelength of neutron in thermal equilibrium at temperature T is nearly h 6 63 x 10 34 SI units kg 1 38 x 10 23 SI units m 1 67 x 10 27 kg 1 3 30 8 T 0 308 A 3 08 2 4 0 0308

Q No 13 A B DD A Find out value of Y 1 2 3 4 Correct Answer 1 Your Answer 3 A B A B A B D Y

In YDSE 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used If the wavelength of light is changed to 400 nm the number of fringes observed in the same segment of the screen is given by 12 18 24 O 30

Young s double slit experiment is performed in air an then performed in water The fringe width O will remain same O Will decrease O Will increase O Will be infinite H AMER

There exists a uniform magnetic field perpendicular to the plane of the figure in a cylindrical region of radius a the magnetic field is increasing at a constant rate of aTs 1 A particle having charge q is at a point P outside the field region The particle is slowly moved to infinity Calculate work done by the external agent in moving the particle to infinity along tangential direction PQ 2 1 3 qra a 4 q a a 6 qra a 3 4 0

Candle C Lens L Screen S 1 the screen in the direction of the lens or the lens in the direction of the screen 2 the screen in the direction of the lens or the lens away from the screen 3 the screen away from the lens or the lens in the direction of the screen 1 neither the screen nor the lens

Two coherent monochromatic point sources S and S of wavelength 600 nm are placed symmetrically on either side of the centre of the circle as sown The sources are separated by distance d 1 8 mm This arrangement produces interferences fringes visible as alternate bright and dark spots on the circumference of the circle The angular separation between two consecutive bright spots is 40 Which of the following options is are correct 2017 A dark sport will be formed at the point P At P the order of the fringe will be maximum The total number of fringes produced between P and P in the first quadrant is close to 3000 The angular separation between two consecutive bright spots decreases as we move from P to A B C D S ld 40 S

5 A uniformly charged solid sphere of radius R has potential Vo measured with respect to on its Vo surface For this sphere the equipotential surfaces with potentials 3V 5V 3Vo 4 and 17 have 4 2 4 radius R R R and R4 respectively Then 1 R 0 and R R4 R 3 R 0 and R R4 R 2 R 0 and R R R4 R 4 2R R

What is expected when 20 kn 1 W resistor in parallel are used instead of 1 10K 1 W O a Provides less power O b Provides higher current O c Provides more power O d Provides more tolerance

In ultrasonic interferometer the distance between two positions of reflector at which maximum current is found is 2 5 mm The velocity of the sound sound in air is 440 m s The frequency of the ultrasound used is 88 kHz 176 kHz 1 10 MHz 2 MHZ

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point 1 covalent bonding 2 metallic bonding 3 van der Waal s bonding

A battery of emf 10 V and internal resistance of 30 is connected to a resistor The current in circuit is 0 5 A What is terminal voltage of battery 2 6 V O 9 5 V 7 5 V 8 5 V

5 Two men can swim in still water at the rate of 5 km h One swims upstream a distance equal to the width of the river half km and back again The other swim to a point straight across and back again Assuming that the velocity of the river is 3 km h find the difference in times taken by them

A charge Q is placed at origin The electric potential due to this charge at a pointi space is V The work required by external agent force to bring a charge qo from infinity to that point is Vqo Va 2 10

7 A square loop of side 5 cm enters a magnetic field with 1 cms The front edge enters the magnetic field at t 0 then which graph best depicts emf 1 2 3 104 TR eer on 3 0 5 3 10 V 5cm 0 5 20 X X 20 25 X X 20 25 X X 20cm X X X X t s 25 t s X X X X t s x B 0 6T X

a starts 24 A particle of specific charge charge mass moving from the origin under the action of an electric field E Eoi and magnetic field B Bok Its velocity at x0 0 0 is 41 31 The value of xo is 25 2 Eo a 13 Eo e 2 Bo b 16 a Bo E d 5a 2 Bo

On increasing the plate separation of a charged capacitor with insulated hand with battery still connected the stored energy O Increases O Decreases Remains constant Becomes zero

A 31 0 cm diameter hollow sphere is suspended by a wire The system requires a torque of 0 264 N m to twist the wire and rotate the sphere 0 795 radians When the torque i removed the system oscillates with a period of 11 seconds What is the mass of the sphere

A particle having charge q and mass m is projected with velocity 2 3 in unifor electric field E Ej change in momentum of particle during a time interval At is O qEoAt qE At 2 qEoAt Zero