Physics question and answers for August 25, 2024
- Q 2 If a ladder is not in balance against a smooth vertical wall then it can be made in balance by A Decreasing the length of ladder B Increasing the...
- Q A light of amplitude A and wavelength is incident on a metallic surface then saturation current flows is proportional to assume cut off wavelength A A A if2 20 B...
- Q 4 Depends both on the intensity and frequency of the incident When stopping potential is applied in an experiment on photoelectric effect no photocurrent is observed This that 1 the...
- Q Figure shows the intensity wavelength relations of X rays coming from two different Coolidge tubes The solid curve represents the relation for the tube A in which the potential difference...
- Q mathongo Q28 JEE Main 2020 9 January Evening mathongo mathongo An electron gun is placed inside a long solenoid of radius R on its axis The solenoid has nathongo turns...
- Q 3 three atom either two In a hypothetical atom if transition from n 4 to n 3 produces visible light then the possible transition to obtain infrared radiation is n...
- Q When an ideal gas is compressed isothermally then its pressure increases because 1 its potential energy decreases 2 Its kinetic energy increases and molecules move apart 3 its number of...
- Q In Bohr s model of hydrogen atom the centripetal force is provided by the Coulomb attraction between the proton and the electron If a is the radius of the ground...
- Q b Two concentric circular loops of radius 1 cm and 20 cm are placed coaxially i Find mutual inductance of the arrangement ii If the current passed through the outer...
- Q 4 the photoelectrons are disper If the frequency of light in a photoelectric experiment is doubled then stopping potential will be doubled 2 be halved 3 become more than double...
- Q An image of the sun is formed by a lens of focal length 30 cm on the metal surface of a photo electric cell and in produces a current I...
- Q The period of a simple pendulum that is 1 00 m long on another planet is 133s What is the acceleration due to gravity on this planet if the mass...
- Q roton with kinetic energy of 1 MeV moves from south to north It gets an acceleration of 10 2 m s y an applied magnetic field west to east The...
- Q When the 0 05 kg body is in the position shown the torsional spring at O is pretensioned so as to exert a 0 75 N m clockwise moment on...
- Q 22 In an arrangement of two concentric conducting shells with centre at origin and radii a and b a b charges Q and Q are given to inner and outer...
- Q A block placed under the head of the claw hammer as shown greatly facilitates the extraction of the nail If a 50 lb pull on the handle is required to...
- Q 2 0 cm An 20 Two charges q 3 0 C and q2 4 0 C initially are separated by a distance r external agent moves the charges until they...
- Q The tension in cable AB is 100 N Determine the moment about O of this tension as applied to point A of the T shaped bar The dimension b is...
- Q Consider a hollow spherical conductor that has a potential of 300 volts at its outside surface The potential inside the hollow space must be a Zero at the center and...
- Q ssuming Laplace s law for a spl brane derive the expression for the capillary rise of a wetting liquid OR Obtain the relation between surface tension and rise of a...
- Q law for a spherical mem brane derive the expression for the capillary rise of a wetting liquid OR Obtain the relation between surface tension and rise of a liquid in...
- Q If the perpendicular distance between the point application of force and the axis of rotaion is infinity Select one a No rotation unless the contact is being broken O b...
- Q d their lines of action are at equal The 30 N force P is applied perpendicular to the portion BC of the bent bar Determine the moment of P about...
- Q The ionization potential for second He electron is 13 6 eV 2 27 2 eV 354 4 eV 4 100 eV An electron makes a transition from orbit n 4...
- Q A body in one dimensional motion has zero speed at an instant At that instant it must have 1 Zero velocity 2 Zero acceleration 3 Non zero velocity 4 Non...
- Q A body of mass m accelerates uniformly from rest to v in time t The instantaneous power delivered to the body an function of time t is AIEEE 200 1...
- Q Question48 A student of height h jumps vertically up from the squat position At the top point of the jump the students center of mass is at a height 3h...
- Q 18 m How much energy is lost due to air friction g 1 20 J 2 30 J 3 40 J 4 10 J An engine pumps water continuously through...
- Q Q23 Figure shows a ball having a charge q fixed at a point A Two identical balls having charges q and q and mass m each are attached to the...
- Q A parallel beam of light 5000 is incident at an angle x 30 with the normal to the slit plane in a young s double slit experiment Assume that the...
- Q 3 twice the original value Mark the correct statement In photo electric effect electrons are emitted from metal surface when light falls on it 2 the kinetic energy of photo...
- Q spheres of radii r and r are touched and separated Calculate the ratio of their i Charges iii Self energy v Surface charge density ii Potential iv Electric field at...
- Q Displacement current is same as Question Type Single Correct Type 1 2 conduction current due to flow of free electron 4 conduction current due to flow of positive ions conduction...
- Q A particle of mass M starting from rest undergoes uniform acceleration If the speed acquired in time T is V power delivered to the particle is AIPMT Mains 2 MV...
- Q 31 The voltage of clouds is 4 x 106 V with respect to ground In a lightning strike lasting 100 ms a charge of 4 C is delivered to the...
- Q 3 5 When the velocity of body is variable 1 Its speed may be constant 2 Its acceleration may be constant 3 Its average acceleration may be constan 4 All...
- Q 27 Two charged metallic spheres of radii r and r are touched and separated Calculate the ratio of their i Charges iii Self energy v Surface charge density 28 Just...
- Q A sphere of mass 500 g starts moving with an acceleration of 10 m s on application of an impulsive force The force acts on it for 0 5 s...
- Q demans The heart of a man pumps 5 litres of blood through the arteries per minute at a pressure of 150 mm of mercury It density of mecrury be 13...
- Q From NC The displacement of a charge Q in the electric field E e i e 3 ezk is r a bj The work done is 1 Q ae be...
- Q Q 183 The radii of two columns of a U tube are r and r When a liquid of density p and angle of contact 0 0 is filled in...
- Q A car of mass m starts from rest and accelerates so that the instantaneous power magnitude P The instantaneous velocity of this car is proportional to 1 t P 3...
- Q P Q A particle of mass m is driven by a machine that delivers a constant power k watts If the particle starts from rest the FE and and F...
- Q A particle is projected with speed u at an angle 60 with horizontal then find the speed when its angle with horizontal changes to 30 Question Type Single Correct Type...
- Q A body moves from rest with a constant acceleration Which one of the following graphs represents the variation of its kinetic energy K with the distance travelled x AIIMS 2016...
- Q 840 J of heat is required to raise the temperature of 2 moles of an ideal gas from 20 C to 40 C at constant pressure The amount of heat...
- Q 1 200 J 3 A vertical spring with force constant k is fixed on a table All ball of mass m at a height h above the free upper end...
- Q An engine pumps water continuously through a hose Water leaves the hose with a velocity v and m is the mas unit length of the water jet What is the...
- Q A block of mass 50 kg is projected horizontally on a rough horizontal floor The coefficient of friction between the block and the floor is 0 1 The block strikes...
- Q A body of mass 0 5 kg experience a force F 2 3x N where x in metre is the displacement from origin It is released to move along x...
- Q 31 10 J ii When an object is shot from the bottom of a long smooth inclined plane kept at an angle 60 with horizontal it can travel a distance...
- Q Four identical particles each of mass m and charge q are kept at the four corners of a square of length L The final velocity of these particles after setting...
- Q 23 A dipole is placed in constant electric field E as shown If it is released from rest from this position find the kinetic energy gained when it is parallel...
- Q during the time the particle goes up is 1 0 5 J 2 1 25 J A particle is projected at 60 to the horizontal with 1 K 2 zero...
- Q 2 759 A piece of cloud is having area 25 x 106 m and electric potential of 105 volts If the height of cloud is 0 75 km then energy...
- Q Which of the following statement is not true 1 Work done by conservative force on an object depends only on the initial and final states and not on the path...
- Q Starting at rest a 10 kg object is acted upon by only one force as indicated in figure Then the total work done by the force is force N 30...
- Q 1 8 J 2 11 J A bullet of mass 10 g moving horizontally with a celocity of 400 ms strikes a wood block of mass 2 kg which suspended...
- Q is 3 9 A bucket containing water of depth 10 cm is kept in a lift which is moving vertically upwards with an acceleration which is equal to 1 times...
- Q 4 the work done by the force of gravity is 20 J in the above Is A particle of mass m is moving with speed u It is stopped by...
- Q 1 E 2 2 2E 3 E 4 A stone projected vertically up with a velocity u reaches a maximum height h When it is at a height 3h 4...
- Q Three charges Q q and q are placed at the vertices of a right angled isosceles triangle as shown The net electrostatic energy of the configuration is zero if Q...
- Q 20 A 1 C charge is uniformly distributed on a spherical shell given by the equation x y 2 25 What will be the intensity of electric field at a...
- Q 4 The ratio of electric potential due to a short electric dipole at point A whose position vector w r t centre of dipole makes 60 angle with direction of...
- Q The potential energy for a force field F is given by U x y sin x y Magnitude of the force acting on the particle Telegrali of mass m at...
- Q The work done by the frictional force on a surface in drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing...
- Q The acceleration due to gravity at the latitude 60 on the earth becomes zero if the angular velocity of rotation of earth equal to 2g R g 3R 5g R...
- Q long solenoid has n 420 turns per meter and carries a current given by I 35 0 1e 1 60t where I is in amperes and t is in seconds...
- Q 14 In the circuit all bulbs consume same power resistance of bulb 1 is 36 2 then resistance of bu 3 and 4 are BA 1 42 122 3 92...
- Q 72 Two soap bubbles of the same soap solution have radii 3 cm and 1 5 cm If the excess pressure inside the bigger bubble is 40 dyn cm what...
- Q Two stars of masses 3 x 1031 kg each and at distance 2 x 10 1 m rotate in a plane about their common centre of mass O A meteorite...
- Q iii the amplitude is doubled iv the gravity at a place is decreased Solve the following numericals 1 A man riding a scooter travels a distance of 50 metres in...
- Q 6270 From NCERI A charge of 10 e su is placed at a distance of 2 cm from a charge of 40 e s u and 4 cm from another...
- Q 2 A block of mass M is hanging over a smooth and light pulley through a light string The other end of the string is pulled by a constant force...
- Q The displacement of a charge Q in the electric field E e i ez ezk is r ai bj The work done is 1 Q ae be 2 Q ae...
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