Practice Set 1
A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2Ω each and leaves by the corner R. The currents i1 in ampere is __________.
26
Sep
A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2Ω each and leaves by the corner R. The currents i1 in ampere is __________. A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2Ω each [...]
Two identical conducting spheres with negligible volume have 2.1 nC and –0.1 nC charges, respectively. They are brought into contact and then separated by a distance of 0.5 m. The electrostatic force acting between the spheres is__________× 10^–9 N. [Given : 4πε0 = 1/9×10^9 SI unit]
26
Sep
Two identical conducting spheres with negligible volume have 2.1 nC and –0.1 nC charges, respectively. They are brought into contact and then separated by a distance of 0.5 m. The electrostatic force acting between the spheres is__________× 10^–9 N. [Given : 4πε0 = 1/9×10^9 SI unit] respectively. They are brought into contact and then separated [...]
The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 4% will be ___%.
26
Sep
The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 4% will be ___%. The percentage increase in the speed of transverse waves produced in a stretched string if the tension is increased by 4% will be ___%. September 26, 2021 Category: JEE Mains Physics [...]
A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52 K, its efficiency is doubled. The temperature in Kelvin of the source will be _________.
26
Sep
A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52 K, its efficiency is doubled. The temperature in Kelvin of the source will be _________. A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink [...]
The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy as that of the X-ray photons is x/3 h kg. The value of x is_________. (h = Planck’s constant)
26
Sep
The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy as that of the X-ray photons is x/3 h kg. The value of x is_________. (h = Planck’s constant) The wavelength of an X-ray beam is 10Å. The mass of a fictitious particle having the same energy [...]
The initial velocity vi required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, may be described in terms of escape velocity ve such that v i = √ x/y × v e. The value of x will be ________.
26
Sep
The initial velocity vi required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, may be described in terms of escape velocity ve such that v i = √ x/y × v e. The value of x will [...]
Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.20 m. The charge on each of the sphere is a / 21 × 10^− 8 C. The value of ‘a’ will be ______. [Given g = 10 ms^–2]
26
Sep
Two small spheres each of mass 10 mg are suspended from a point by threads 0.5 m long. They are equally charged and repel each other to a distance of 0.20 m. The charge on each of the sphere is a / 21 × 10^− 8 C. The value of ‘a’ will be ______. [Given [...]
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that :
26
Sep
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that : Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 mm. If the diameter of the [...]
Match List I and List II. Choose the correct answer from the options given below :
26
Sep
Match List I and List II. Choose the correct answer from the options given below : Match List I and List II. Choose the correct answer from the options given below : September 26, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43 V. The new wavelength is :
26
Sep
The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0.710 V. When the incident wavelength is changed to a new value, the stopping potential is 1.43 V. The new wavelength is : The stopping potential for electrons emitted from a photosensitive surface illuminated by light of [...]