20 solutions available
Question 1(b)A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minute and a girl weighing 30 kgf does the same in 3 minutes....
Question 1(d)Calculate the mass of ice required to lower the temperature of 300 g of water at 40°C to water at 0°C. (Specific latent heat of ice =...
Question 2(b)A boy uses blue colour of light to find the refractive index of glass. He then repeats the experiment using red colour of light. Will...
Question 2(c)Copy the diagram given below and complete the path of light ray till it emerges out of the prism. The critical angle of glass is 42°. In...
Question 2(e)The ratio of amplitude of two waves is 3 : 4. What is the ratio of their :(i) loudness?(ii) frequencies? [2]
Question 3(c)The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A...
Question 3(d)A music system draws a current of 400 mA when connected to a 12 V battery.(i) What is the resistance of the music system?(ii) The music...
Question 4(a)State the characteristics required of a good thermion emitter. [2]
Question 4(b)An element ZSA decays to 85R222 after emitting 2 α particles and 1 β particle. Find the atomic number and atomic mass of the element S....
Question 4(d)State the characteristics required in a material to be used as an effective fuse wire. [2]
Question 4(e)Which coil of a step up transformer is made thicker and why? [2]
Question 5(a)A stone of mass 'm' is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the...
Question 5(c)(i) An effort is applied on the bigger wheel of a gear having 32 teeth. It is used to turn a wheel of 8 teeth. Where is it used?(ii) A...
Question 6(b)Some ice is heated at a constant rate, and it's temperature is recorded after every few seconds, till steam is formed at 100°C. Draw a...
Question 6(c)A copper vessel of mass 100 g contains 150 g of water at 50 °C. How much ice is needed to cool it to 5 °C?Given : Specific heat capacity...
Question 7(c)What do you understand by the term 'Scattering of light'? Which colour of white light is scattered the least and why? [4]
Question 8(b)(i) What is an echo?(ii) State two conditions for an echo to take place. [3]
Question 8(c)(i) Name the phenomenon involved in tuning a radio set to a particular station.(ii) Define the phenomenon named by you in part (i)...
Question 9(c)A battery of e.m.f. 12 V and internal resistance 2 Ω is connected with two resistors A and B of resistance 4 Ω and 6 Ω respectively...
Question 10(c)(i) Represent the change in the nucleus of a radioactive element when a β particle is emitted.(ii) What is the name given to elements...