X Standard - 10th - Science - Second Midterm Test - Question Paper

II Mid Term Test

Class : X STD Marks:50

Subject : SCIENCE Time: 2.00Hrs

I. Choose the correct answer : 8x1=8

1.The frequency ,which is audible to the human ear is

a) 50 kHZ b) 20kHZ c) 15000kHZ d)10000kHZ

2.__________ isotope is used for treatment of cancer

a) Radio Iodine b) Radio Cobalt c) Radio Carbon d) Radio Nickle

3.The pH of a solution is 3.Its [OH^-] concentration is

a) 1x10^-3M b) 3M c) 1x10^-11M d) 11M

4.Which of the following are used as anaesthetics?

a) carboxylic acids b) Ethers c)Esters d) Aldehydes

II. Answer any 6 from the following questions : 6x2=12

9. What is longitudinal waves?

10. Define critical mass.

11.Why does the reaction rate of a reaction increase on raising the temperature ?

12. Name the simplest ketone and give its structural formula

III.Anwer any 4 from the following questions:

(Question no.18 is compulsory) 4x4=16

17. a)State two conditions necessary for an echo?(2m)

b) Write any 2 medical applications of echo?(2m)

18.(i)Calculate the amount of energy released when a radioactive substance undergo fusion and results in a mass defect of 2 kg .(2m)

(ii)What is the pH of 1.0x10^-5 molar solution of KOH ?(2m)

19.State soddy and Fajan’s displacement law .

IV.Answer all questions : 7x2=14

23. a)Write any 2 factors which affect the speed of sound in gases ?(4m)

b)What do you understand by the term ‘Ultrasonic vibrations’?(3m)

c) State three uses of ultrasonic vibrations .(3m)

(OR)

24.a) How is ethanol manufactured from sugarcane?(5m)

b)How is ethanoic acid prepared from ethanol ? Give the chemical equation(2m)

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