CBSE 2023 Term II - Circle Practice Session#!#Karo Tayari Doubtnut k Sath

(ii)If each terms of a given AP,is multiplied or devided by a non zero constant k; then the resulting sequence is an AP with common difference kd or (d)/(k); where d is the common difference of the given AP.

A capacitor consists of two stationary plates shaped as a semi-circle of radius R and a movable plate made of dielectric with permittivity K and capable ofrotating about an axis O between the stationary plates. The thickness of movable plate is equal to d which is practically the separation between the stationary plates. A potential difference V is applied to the capacitor. Find the magnitude of the moment of forces relative to the axis O acting on the movable plate in the position shown in figure.

At 298 K, the vapour pressure of pure benzene , C_(6)H_(6) is 0.256 bar and the vapour pressure of pure toluene C_(6)H_(5)CH_(3) is 0.0925 bar . If the mole fraction of benzene in solution is 0.40 (i) what is the total vapour pressure of the solution ? (ii) Calculate the composition of the vapour in terms of mole fraction.

During a practice session in a stadium an athlete runs along a circular track and her performance is observed by her coach standing at a point on the circle and also by her physiotherapist standing at the centre of the circle. The coach finds that she covers an angle of 72^(@) in 1 min. What will be the angle covered by her in 1 second according to the measurement made by her physiotherapist?

The reading of an ammeter in the circuit (i) I when key K_(1) closed key K_(2) is open (ii) I//2 when both keys K_(1) and K_(2) are closed Find the expression for the resistance of X in terms of the resistances of R and S

(a) Explain the following terms : (i) Order of a reaction (ii) Molecularity of a reaction (b) The rate of a reaction increases four times when the temperature changes from 300 K to 320 K. Calculate the energy of activation of the reaction, assuming that it does not change with temperature. (R = 8.314 J K^(-1) mol^(-1))

A child is swinging a ball of mass M around on a light spring which has spring constant k . The ball describes a horizontal circle. The stretched spring has a length a horizontal circle. The stretched spring has a length l and makes an angle theta with the vertical as shown in fig. the acceleration due to gravity is g neglect air resistance. a. In terms of only the given quantities , what is the magnitude of force F that the spring exerts on man M ? b.In terms of F,k and l what is the natural length l_(0) of the spring i.e. the length of the spring when it is not steched? c. In terms of F, l,M and B what is the speed v of the ball?

(a) Define the following terms : (i) Mole fraction (ii) Ideal solution (b) 15.0 g of an unknown molecular material is dissolved in 450g of water . The resulting solution freezes at -0.34^(@)C . What is the molar mass of the material ? (K_(f) for water = 1.86 K kg mol^(-1))