Practice Set 1
Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :
26
Sep
Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is : Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is : September 26, 2021 Category: JEE Mains Physics 2002-2019 Solved [...]
A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent at heat is J, the rise in heat energy per unit volume will be
26
Sep
A large number of water drops each of radius r combine to have a drop of radius R. If the surface tension is T and the mechanical equivalent at heat is J, the rise in heat energy per unit volume will be A large number of water drops each of radius r combine to have [...]
LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [h = 6.63 × 10^–34 Js and c = 3 × 10^8 ms^–1]
26
Sep
LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [h = 6.63 × 10^–34 Js and c = 3 × 10^8 ms^–1] LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate [...]
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : An electron microscope can achieve better resolving power than an optical microscope. Reason R : The de Broglie’s wavelength of the electrons emitted from an electron gun is much less than wavelength of visible light. In the light of the above statements, choose the correct answer from the options given below:
26
Sep
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : An electron microscope can achieve better resolving power than an optical microscope. Reason R : The de Broglie’s wavelength of the electrons emitted from an electron gun is much less than wavelength [...]
The temperature θ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures θ1 and θ2 (as shown in figure) is given by :
26
Sep
The temperature θ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures θ1 and θ2 (as shown in figure) is given by : having thermal resistances R1 and R2 as well as top and bottom temperatures θ1 and θ2 (as shown in figure) is [...]
If two similar springs each of spring constant K1 are joined in series, the new spring constant and time period would be changed by a factor :
26
Sep
If two similar springs each of spring constant K1 are joined in series, the new spring constant and time period would be changed by a factor : If two similar springs each of spring constant K1 are joined in series the new spring constant and time period would be changed by a factor : September [...]
In a Young’s double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be:
26
Sep
In a Young’s double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be: In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter [...]
Four identical solid spheres each of mass ‘m’ and radius ‘a’ are placed with their centres on the four corners of a square of side ‘b’. The moment of inertia of the system about one side of square where the axis of rotation is parallel to the plane of the square is :
26
Sep
Four identical solid spheres each of mass ‘m’ and radius ‘a’ are placed with their centres on the four corners of a square of side ‘b’. The moment of inertia of the system about one side of square where the axis of rotation is parallel to the plane of the square is : The logic [...]
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Body ‘P’ having mass M moving with speed ‘u’ has head-on collision elastically with another body ‘Q’ having mass ‘m’ initially at rest. If m
26
Sep
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Body ‘P’ having mass M moving with speed ‘u’ has head-on collision elastically with another body ‘Q’ having mass ‘m’ initially at rest. If m The logic circuit shown above is equivalent to : [...]
A planet revolving in elliptical orbit has : (A) a constant velocity of revolution. (B) has the least velocity when it is nearest to the sun. (C) its areal velocity is directly proportional to its velocity. (D) areal velocity is inversely proportional to its velocity. (E) to follow a trajectory such that the areal velocity is constant. Choose the correct answer from the options given below :
26
Sep
A planet revolving in elliptical orbit has : (A) a constant velocity of revolution. (B) has the least velocity when it is nearest to the sun. (C) its areal velocity is directly proportional to its velocity. (D) areal velocity is inversely proportional to its velocity. (E) to follow a trajectory such that the areal velocity [...]