Class – X
Subject –Science (PHYSICS / CHEMISTRY)
MM : 80
Q.1 Give one example of redox reaction which is also displacement reaction. Doubt 1x3=3
Q.2 Electrical Resistivity of few material is givenin ohm-meter. Which of these can be used for heating element (give reason) x = 6.92 x 10-8, y = 2.9 x 105, z = 3.9 x 106, p = 2x10-4, q =4x10-5
Q.3 Name and state the rule which gives the direction of induced current. Doubt
Q.4 A proton enters a magnetic field at right angles to it as shown in 2x7=14
fig. what is the direction of force acting on the proton. Doubt
Q.5 What is a major constituent of Biogas (Gobar Gas)? How is Biogas superior to dry animal dung as a fuel.
Q.6 A radio set of 60w runs for 50 hrs. how much energy is consumed (Joules & KWH).
Q.7 A baker found that cake prepared is hard and small in size. Which ingredient has he for gotten to add? Write the name and formula of ingredient and explain how it would be help to make cake spongy and soft.
Q.8 Write the Lewis dot structure of (a) H2S (b) Calcium Chloride Praveen sir
Q.9 An aqueous solution has hydrogen ion concentration (H+) = 1x10-9 mol L-1 Praveen sir
(a)Is solution acidic or basic (b)what is the pH of solution (c)How would its pH changes on adding few drops of 1M HCl to it explain
Q10 Why metals replace hydrogen from dilute acids where non metal do not ? Explain Praveen sir
Q11 You are given following current time graphs from two different sources
(a ) Name the type of current in two cases(b)what is the frequency of current in case II in India © Which one is prefer over another why
Q12 Draw a schematic diagram of circuit consisting battery of 12V , three resistors of 5 ohm,10 ohm, and 20ohm connected in parallel.Show an ammeter and voltmeter to measure current and pot. Diff. also calculate the current in circuit
Q13 Draw a sketch of pattern... [continues]
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