Physics question and answers for July 23, 2024
- Q A convex lens is used to form an image of an object on a wall By moving the lens 40 cm nearer to the wall a sharp image is again...
- Q When light of maximum wavelength 300 nm falls on a photoelectric emitter photoelectrons are liberated For another emitter however light of maximum wavelength 600 nm causes photoelectric emission The ratio...
- Q 3 May increase or decrease in size 4 Have no relation with the field A paramagnetic material is kept in a magnetic field The field is increased till the magnetisation...
- Q alvanometer is magnet The magnetic field the coil The 2 625 A m 3 125 A m 4 425 A m A ferromagnetic material is placed in an extern magnetic...
- Q A body covers half of its journey with speed 20 km h and rest half of its journey with 40 km h What will be the average speed of this...
- Q 7 Consider a radioactive substance which decays following the law of disintegration At an instant t its activity is R and at time t it becomes Find 1 R the...
- Q 59 A uniform disc of radius R 2 3 m is moving on a horizontal surface without slipping At some instant its angular velocity is 1 rad s and angular...
- Q 7 A wire has a mass 0 3 0 003 g radius 0 5 0 005 mm and length 6 0 06 cm The maximum percentage error in the measurement...
- Q The mass defect in a nuclear fusion reaction is 0 05 What amount of energy will be librated in one kg fusion reaction 1 45 102 J 2 45 10...
- Q An achromatic convergent system of focal length 20 cm is made of the lenses in contact of materials having dispersive powers in the ratio 1 2 Their focal length must...
- Q 8 A swimmer can swim in still water at a speed of 15 km h A river is flowing at 5 km h The swimmer starts from a point and...
- Q The maximum value of index of refraction of a material of a prism which allows the passage of light through it when the refracting angle of the prism is A...
- Q Match the corresponding entries of column 1 with column 2 Where m is the magnification produced by the mirror Column 1 A B C D m 2 1 2 m...
- Q The following four wires are made of the same material and are at the same temperature Which one of them has highest electrical resistance 1 Length 50 cm diameter 0...
- Q The electric resistance of a certain wire of iron is R If its length and radius are both doubled then 1 The resistance will be doubled and the specific resistance...
- Q A solid metallic sphere has a charge 3Q Concentric with this sphere is a conducting spherical shell having charge Q The radius of the sphere is a and that of...
- Q Aakash Rank Booster Test Series for NEET 2020 26 For nuclear stability consider the reaction of a nucleus zXA 2 YA e v If My and My are the masses...
- Q A human body excretes certain material by a law similar to radioactivity The body excretes half the amount injected in 24 h Find the time in which activity falls to...
- Q 3 A particle is thrown in air following trajectory y ax 3x where a and B are constant x and are horizontal line and vertical line respectively It s angle...
- Q 4 Both 1 and 2 10 An astronomical telescope has magnification 8 for normal adjustment A person using this telescope finds that when distance between objective and eyepiece is made...
- Q If the kinetic energy of a body is increased by 300 its momentum will increase by 1 100 150 200 400 3 Correct Answer 1
- Q 7 The charge flown through a circuit in the time interval between t and t dt is given by dq e t dt where is a constant Find the total...
- Q Employ Norton s theorem to reduce the network connected to RL to o two components b Calculate the downward directed current flow through RL if it is a 3 3k...
- Q Figure shows a container having liquid of variable density The density of liquid varies as p Po 4 3h Here ho and p are ho constants and his measured from...
- Q 33 Two bodies A and B each of mass 100 gm are allowed to move along a frictionless typical path as shown below In order to have the same kinetic...
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