Barsana Biogas Project, which was seen in the news, is situated in which state?
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When is the International Day of Older Persons celebrated?
When is World Down Syndrome Day observed annually?
A teacher should make an attempt to understand the potentialities of his/her students. Which of the following fields is related to this objective?
Select the appropriate techniques favourable for motivating students for learning in the classroom.
(i) Encouraging maximum participation of students in the classroom
(ii) Encourage competition for marks
(iii) Help students set goals based on their interest
(iv) Giving freedom to students for expressing their ideas
Choose the correct option.
The ____________ of learning in children, in which the learner perceives and responds to the whole situation, comes under Kohler's theory of understanding.
A magnetic field exists in the region a < x < 2a, and , in the region 2a < x < 3a, where B0 is a positive constant. A positive point charge moving with a velocity , where v0 is a positive constant, enters the magnetic field at x = a. The trajectory of the charge in this region can be like
An infinite number of charges, each equal to 4C, are placed along the x-axis at x = 1 m, x = 2 m, x = 4 m, x = 8 m and so on. The total force on a charge of 1C placed at the origin is
A wire of length L and 3 identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by ΔT in a time t. A number N of similar cells is now connected in series with a wire of the same material and cross-section but of length 2L. The temperature of the wire is raised by the same amount ΔT in the same time t. the value of N is
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
If in a circular coil A of radius R, current I is flowing and in another coil B of radius 2R a current 2I is flowing, then the ratio of the magnetic fields BA and BB, produced by them will be
A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?
Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.
A coil of 100 turns is pulled in 0.04 sec. between the poles of a magnet, if its flux changes from 40 x 10-6 Wb per turn to 10-5 Wb per turn, then the average emf induced in the coil is
The terminal voltage across a battery of emf E can be
If the force acting on a point charge kept on the axis of an electric dipole is F, what will be the amount of force if the distance of the point charge is doubled from the dipole?
To get the maximum flight, a ball must be thrown as
How many directions are possible for the same horizontal range?
In a circuit an a.c. current and a d, c. current are supplied together. The expression of the instantaneous current is given as i = 3 + 6 sin wt. Then the rms value of the current is
A wheel has an angular acceleration of 4 rad/s². If it starts from rest, how many revolutions will it complete in 10 seconds?
In the circuit in figure we have ε1 = ε2 = 100V, R1 = 20Ω, R2 = 10 Ω, R3 = 40 Ω and R4 = 30 Ω. Find the reading of the ammeter (in A). Disregard the resistance of the battery and the ammeter.
A body of mass 2 kg rests on a rough inclined plane making an angle 30o with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is
A radar sends a radio signal of frequency 9 x 109 Hz towards an aircraft approaching the radar. If the reflected wave shows a frequency shift of 3 X 103 Hz, the speed with which the aircraft is approaching the radar in m/s is (velocity of radio signal is 3 X 108 m/s).
Four liters of a diatomic ideal gas ( λ =1.4) confined to a cylinder is subject to a closed cycle. Initially, the gas is at 1.00 atm and at 300 K. First, its pressure is tripled under constant volume. Then, it expands adiabatically to its original pressure. Finally, the gas is compressed isobarically to its original volume. Find the temperature at the end of the cycle