Practice Set 1
A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to: (1 HP = 746 W, g = 10 ms^-2)
19
Sep
A 60 HP electric motor lifts an elevator having a maximum total load capacity of 2000 kg. If the frictional force on the elevator is 4000 N, the speed of the elevator at full load is close to: (1 HP = 746 W, g = 10 ms^-2) A 60 HP electric motor lifts an elevator [...]
A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40, the work done by air is : (3^1.4 = 4.6555) [Take air to be an ideal gas]
19
Sep
A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40, the work done by air is : (3^1.4 = 4.6555) [Take air to be an ideal gas] A litre of dry air at STP expands adiabatically to a volume of 3 litres. If γ = 1.40 [...]
If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of the eye-piece, should be close to :
19
Sep
If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of focal length 5 mm, the focal length of the eye-piece, should be close to : If we need a magnification of 375 from a compound microscope of tube length 150 mm and an objective of [...]
A parallel plate capacitor has plates of area A separated by distance ‘d’ between them. It is filled with a dielectric which has a dielectric constant that varies as k(x) = K(1 + αx) where ‘x’ is the distance measured from one of the plates. If ( αd)
19
Sep
A parallel plate capacitor has plates of area A separated by distance ‘d’ between them. It is filled with a dielectric which has a dielectric constant that varies as k(x) = K(1 + αx) where ‘x’ is the distance measured from one of the plates. If ( αd) The correct match between the entries in [...]
The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 × 10^–16 s. The frequency of revolution of the electron in its first excited state (in Hz) is:
19
Sep
The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 × 10^–16 s. The frequency of revolution of the electron in its first excited state (in Hz) is: The time period of revolution of electron in its ground state orbit in a hydrogen atom is 1.6 × [...]
Two moles of an ideal gas with CP/CV = 5/3 are mixed with 3 moles of another ideal gas with CP/CV = 4/3. The value of CP/CV for the mixture is:
19
Sep
Two moles of an ideal gas with CP/CV = 5/3 are mixed with 3 moles of another ideal gas with CP/CV = 4/3. The value of CP/CV for the mixture is: Two moles of an ideal gas with CP/CV = 5/3 are mixed with 3 moles of another ideal gas with CP/CV = 4/3. The [...]
Which of the following gives a reversible operation?
19
Sep
Which of the following gives a reversible operation? Which of the following gives a reversible operation? September 19, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
The current I1 (in A) flowing through 1 Ω resistor in the following circuit is
19
Sep
The current I1 (in A) flowing through 1 Ω resistor in the following circuit is The current I1 (in A) flowing through 1 Ω resistor in the following circuit is September 19, 2021 Category: JEE Mains Physics 2002-2019 Solved Video Solutions , Practice Set 1 ,
Two infinite planes each with uniform surface charge density + σ are kept in such a way that the angle between them is 30°. The electric field in the region shown between them is given by:
19
Sep
Two infinite planes each with uniform surface charge density + σ are kept in such a way that the angle between them is 30°. The electric field in the region shown between them is given by: Two infinite planes each with uniform surface charge density + σ are kept in such a way that the [...]
Speed of a transverse wave on a straight wire (mass 6.0 g, length 60 cm and area of cross-section 1.0 mm^2) is 90 ms^–1. If the Young’s modulus of wire is 16 × 10^11 Nm^–2, the extension of wire over its natural length is :
19
Sep
Speed of a transverse wave on a straight wire (mass 6.0 g, length 60 cm and area of cross-section 1.0 mm^2) is 90 ms^–1. If the Young’s modulus of wire is 16 × 10^11 Nm^–2, the extension of wire over its natural length is : length 60 cm and area of cross-section 1.0 mm^2) is [...]