Science and technology

Q.1 The use of chemicals or drugs to selectively distroy infectious micro-organism without                        destroying the live tissues, or the host,is known as       A.Chemotherapy       B.Gene therapy       C.Drug therapy       D.Plastic surgery Answer:-A Q.2 Gun powder, which is an explosive comprises of charcoal, sulphur and       A. glycerine       B. salt petre       C. nitro glycerine       D. dynamite Answer: Option B Q.3 Gelatine which is a nitrogenous organic protein is obtained by the hydrolysis of       A. collagen       B. tannin       C. molasses       D. carbohydrate Answer: Option A

Q.1 Why it keeps us awake,why you think we feel sleepy sometimes even when we are not tired,the          reason is a hormone       A.Adrenaline       B.Adenosine       C.Thyroxine       D.Secrotonine Answer:-B Q.2 Cooking and baking is one of the major activities we do daily that involves chemistry.A chemical        frequently used in baking soda....       A.Sodium bicarbonate       B.Sodium chloride       C.Sodium hydroxide       D.Hydrogen peroxide Answer:-A Q.3 Yogurt,breads, cakes and many other products are formed by multiplication of certain useful                bacteria and the process is called        A.Dehydration        B.Fermentaion        C.Calcination        D.Dehydrogenation Answer:-B

Q.1 Which of the following year is not a leap year?       a) 1960       b) 2080       c) 2024       d) 2100 Answer:-2100 The two conditions that decide that a year is a leap year or not is: • For a year to be a leap year, it should be divisible by 4. • No century is a leap year unless it is divisible by 400. Hence, the year 2100 is not a leap year as it is not divisible by 400. Q.2 26th January, 1996 was a Friday. What day of the week lies on 26th January, 1997?        a) Saturday        b) Sunday        c) Monday        d) Thursday Answer:- Sunday The year 1996 was a leap year. Hence, it adds 2 odd days. As 26th January, 1996 was a Friday, 26th January, 1997 was a Sunday. Q.3 The calendar for the year 2001 is same for which of the following year?        a) 2005        b) 2007        c) 2011        d) 2006 Answer:- 2007 The total number of odd days from 2001 onwards should be zero. Now, as an ordinary year adds 1 odd day and a leap year adds 2 odd days, we have: 2

Q.1 What is the closest star visible to the naked eye?       A.Alpha Centauri       B.Proxima Centauri       C.Procyon Answer:-A Q.2 Procyon is the second brightest star. It is also one of the nearest. On which constellation can we find Procyon?      A.Scorpius      B.Ursa Major      C.Canis Minor Answer:-C Q.3The nearest star to our solar system is Proxima Centauri. Who discovered Proxima Centauri?       A.Edwin Hubble       B.Robert Innes       C.Giovanni Schiaparelli  Answer:-B

Q.1 What change will happen to a bowl of ice and water kept at exactly zero degree Celsius?       a) All ice will melt       b) All water will become ice       c) No change will happen       d) Only a part will melt   Answer:-C Q.2 Bats can fly in the dark due to        a) They can see the object in dark        b) They have weak legs and are likely to attacked by predators        c) They generate flash of light        d) They generate ultrasound waves Answer:-D Q.3 The propagation of sound waves in gas involves        a) Adiabatic compression and rarefaction        b) Isothermal compression and rarefaction        c) Isochoric compression and rarefaction        d) Isobaric compression and rarefaction Answer:-A