Everyday Science Test 7

Total Questions: 25

1 - Which one of the following does a TV remote control unit use to operate a TV set?

A ) Light waves
B ) Sound waves
C ) Microwaves ✅
D ) Radio waves

2 - A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel

A ) Kills bacteria
B ) Kills germs and spores
C ) Absorbs moisture ✅
D ) Absorbs all gases present inside the bottle

3 - Fluorescent tubes are fitted with a choke. The choke coil

A ) Steps up the line voltage
B ) Steps down the line voltage
C ) Reduces current in the circuit ✅
D ) Chokes low frequency currents

4 - The laser produces

A ) A beam of monochromatic coherent light ✅
B ) A beam of monochromatic incoherent light
C ) Highly penetrating X-rays
D ) A beam of a fast moving neutron rays

5 - Which one of the following is not an excretory organ?

A ) Lungs
B ) Liver
C ) Kidney
D ) Adrenal gland ✅

8 - After long period of use,a gray spot develops on the inside of a bulb. This is because

A ) The tungsten filament evaporates and collects there ✅
B ) The heat of the bulb scorches the glass at the top
C ) Dust inside the bulb condenses on the top
D ) Glass undergoes a change due to the heat

10 - A nuclear reactor harnesses nuclear energy by

A ) Nuclear fusion
B ) Spontaneous fission
C ) Uncontrolled chain reaction
D ) Controlled chain reaction ✅

12 - Permanent magnets can be made from

A ) Cobalt ✅
B ) Aluminum
C ) Zinc
D ) Lead

13 - Atmospheric pressure exerted on the earth is due to the

A ) Rotation of the earth
B ) Revolution of the earth
C ) Gravitational pull ✅
D ) Uneven heating of the earth

14 - A photo electrical cell converts

A ) Electrical energy into light energy
B ) Light energy into electrical energy ✅
C ) Light energy into sound energy
D ) Light energy into heat energy

15 - Where does the oxygen that keeps us alive come from?

A ) Carbon dioxide ✅
B ) Carbonated absorbed from soil
C ) Oxides of minerals
D ) Water

17 - The snow on the mountains does not melt all at once when it is heated by the sun because

A ) It becomes very hard.
B ) It reflects most of the heat from the sun ✅
C ) It has a low specific heat capacity
D ) It has a high latent heat of fusion

18 - Where is blood formed in the human body?

A ) Heart
B ) Spleen
C ) Bone marrow ✅
D ) Liver

20 - Trachoma is a disease of the

A ) Brain
B ) Larynx
C ) Ear
D ) Eye ✅

21 - Sodium depletion occurs in excessive sweating,and cannot be corrected by drinking water alone. When uncorrected,it may lead to

A ) Muscle cramps,loss of energy, fatigue and faintness ✅
B ) Increase of urea in blood
C ) Swelling of ankles and feet
D ) Renal failure

22 - The heart of a normal adult human being weighs about

A ) 200 grams
B ) 300 grams ✅
C ) 400 grams
D ) 500 grams

23 - The part of the body directly affected by pneumonia is

A ) Bone tissue
B ) Epidermal tissue
C ) Nervous system
D ) Respiratory system ✅

24 - As the amount of clay in a soil increases,its water retaining capacity

A ) Decreases
B ) Increases ✅
C ) Remains unchanged
D ) None of these

25 - Haemoglobin in the blood is a complex protein rich in

A ) Copper
B ) Gold
C ) Iron ✅
D ) Silver