I. Choose the correct answer.
1. International unit of measuring temperature is _________.
Kelvin b) Fahrenheit c) Celsius d) Joule
Ans: a) Kelvin
2. In thermometer when bulb comes in contact with hot object, liquid inside it
Expands b) contracts c) remains same d) none of above
Ans: a) expands
3. The body temperature of a healthy man is;
0oC b) 37oC c) 98oC d) 100oC
Ans: b) 37oC
4. Mercury is often used in laboratory thermometers because it ______.
Is a harmless liquid
Is silvery in colour and is attractive in appearance
Expands uniformly
Is a low cost liquid
Ans: c) expands uniformly
5. Which of the following temperature conversions is incorrect
K (Kelvin) = oC (Celsius) + 273.15
Ans: d)
6. In the circuit diagram below, 10 units of electric charge move past point x every second. What is the current in the circuit _______
10 A b) 1 A c) 10 V d) 1 V
Ans: a) 10 A
7. In the circuit shown, which switches (L, M or N) must be closed to light up the bulb?
Switch L only
Switch M only
Switch M and N only
Either switch L or switches M and N
Ans: d) Either switch L or switches M and N
8. Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A?
2.5 mA b) 25 mA c) 250 mA d) 2500 mA
Ans: c) 250 mA
9. In which of the following circuits are the bulb connected in series?
Ans: b)
10. When a woolen yarn is knitted to get a sweater, the change can be classified as _____.
Physical change b) chemical change c) endothermic change d) exothermic change
Ans: a) physical change
11. __________ of the following are endothermic changes.
Condensation and melting
Condensation and freezing
Evaporation and melting
Evaporation and freezing
Ans: a) condensation and melting
12. The chemical change is _________.
Water to clouds
Growth of a tree
Cow dung to bio-gas
Ice-cream to molten ice-cream
Ans: c) cow dung to bio-gas
13. _________ is an example of a periodic change.
Earthquake.
Formation of rainbow in sky
Occurrence of tides in seas
Showering of rain
Ans: a) Earthquake
14. ___________ is not a chemical change.
Dissolution of ammonia in water
Dissolution of carbon-di-oxide in water
Dissolution of oxygen in water
Melting of polar ice caps
Ans: d) Melting of polar ice caps
15. Basic unit of life.
Cell b) Protoplasm c) Cellulose d) Nucleus
Ans: a) Cell
16. I am the outer most later of an animal cell. Who am I?
Cell wall b) Nucleus c) Cell membrane d) Nuclear membrane
Ans: c) Cell membrane
17. Which part of the cell is called the brain of the cell?
Lysosome b) Ribosome c) Mitochondria d) Nucleus
Ans: d) Nucleus
18. _______ helps in cell division
Endoplasmic reticulum b) Golgi complex c) Centrivole d) Nucleus
Ans: c) Centriole
19. Suitable term for the various components of cell is_____.
Tissue b) Nucleus c) Cell d) Cell organelle
Ans: d) Cell organelle
20. The following characteristics are essential for classification.
Similarities b) Differences c) Both of them d) None of them
Ans: c) Both of them
21. Approximately ________ species of living organisms found in the earth.
8.7 million b) 8.6 million c) 8.5 million d) 8.8 million
Ans: a) 8.7 million
22. The largest division of the living world is ________.
Order b) Kingdom c) Phylum d) Family
Ans: b) Kingdom
23. Who proposed the five kingdom of classification?
Aristotle b) Linnaeus c) Whittaker d) Plato
Ans: c) Whittaker
24. The binomial name of pigeon is ________.
Homo sapiens b) Rattus rattus c) Mangifera indica d) Columbo livia
Ans: d) Columbo livia
25. Tux paint software is used to _____.
Paint b) Program c) Scan d) PDF
Ans: a) Paint
26. Which toolbar is used for drawing and editing controls in tux paint software?
Left side: Toolbar
Right side : Toolbar
Middel : Tool bar
Bottom : Toolbar
Ans: a) Left side : Toolbar
27. What is the shortcut key for undo option?
Ctrl+Z b) Ctrl+R c) Ctrl+Y d) Ctrl+N
Ans: a) Ctrl+Z
28. Tux Math software helps in learning the ______.
Painting b) Arithmetic c) Programming d) Graphics
Ans: b) Arithmetic
29. In Tux Math, Space cadet option is used for _____.
Simple addition b) Division c) Drawing d) Multiplication
Ans: a) Simple addition
II. Fill in the blanks.
1. Doctor uses clinical thermometer to measure the human body temperature.
2. At room temperature mercury is in liquid state.
3. Heat energy transfer from hotter object to colder object..
4. -7oC temperature is less than 0oC temperature.
5. The common laboratory thermometer is a mercury thermometer.
6. The direction of conventional current is opposite to electron flow.
7. One unit of coulomb is charge of approximately 6.242 x 1018 protons or electrons.
8. Ammeter is used to measure the electric current.
9. In conducting materials electrons are loosely bounded with atoms.
10. S.I unit of Electrical conductivity of a conductor is Siemens / meter (S/m).
11. Filling up a balloon with hot air is a physical change.
12. Stretching gold coin into a ring is a physical change.
13. Opening a gas cylinder knob converts liquid fuel into gaseous fuel. This is an example of physical change.
14. Spoiling of food is a chemical change.
15. Respiration is a exothermic chemical change.
16. The jelly like substance present in the cell is called cytoplasm.
17. I convert the Sun’s energy into food for the plant. Who am I? Chloroplast
18. Mature Red blood cell do not contain a Nucleus.
19. Unicellular organisms can only be seen under a Microscope.
20. Cyctoplasm plus necleoplasm is equal to protoplasma.
21. Gaspard Bauhin in 1623, introduced the binomial nomenclature.
22. Species is the basic unit of classification.
23. Fungi are non-green and non-photosynthetic in nature.
24. The binomial name of onion is Hum sativum.
25. Carolus Linnaeus is known as the Father of Modern Taxonomy.
III. Match the following.
IV. True or False - If False give the correct answer
1. Electron flow is in the same direction to conventional current flow. False
Ans: Electron flow in opposite direction to conventional current flow.
2. The fuse wire does not melts whenever there is overload in the wiring. False
Ans: The fuse wire will melt whenever there is overload to cut power supply.
3. In a parallel circuit, the electric components are divided into branches. True
4. The representation of the electric current is A. True
5. The electrical conductivity of the semiconductor is in between a conductor and an insulator. True
6. Cutting of cloth is an example of a periodic change. False
Ans: Cutting of cloth is a physical change
7. Taking a glass of water and freezing it by placing it in the freezer is chemical change. False
Ans: Freezing is a physical change.
8. A bean plant collecting sunlight and turning it into bean seeds is an example of physical and non-periodic change. False
Ans: Its a chemical change.
9. If the chemical properties of a substance remain unchanged and the appearance or shape of a substance changes it is called a periodic change. False
Ans: It is a physical change.
10. Tarnishing of silver is an example of endothermic change. False
Ans: Tarnishing of silver is a chemical change.
11. Animal cells have a cell wall. False
Ans: Animal cell does not have cell wall.
12. Salmonella is a unicellular bacteria. True
13. Cell membrane is fully permeable. False
Ans: Cell membrane is selectively permeable.
14. Only plant cells have chloroplasts. True
15. Human stomach is an organ. True
16. Ribosomes are small organelles with a membrane. False
Ans: Ribosomes are small but does not have membrane.
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