Choose the correct answer. 10 X 2
1 = 5 M
1. A force can not change [ ]
A) Speed of an object B) Shape of the object
C) Mass D) Direction of object
2. ________ and ________ are called fluids [ ]
A) liquids and gases B) solids and liquids
C) solids and gases D) None of these.
3. Any scientific fibre combined with two or more other fibres is called [ ]
A) Mixing B) Alloying C) Blending D) Picking.
4. Which of the following non metal conduct electricity [ ]
A) Sulphur B) Graphite C) Iodine D) Carbon
5. Velocity of sound in vaccum is [ ]
A) less B) zero C) More D) None
6. i = 600 r = ___? [ ]
A) 650 B) 300 C) 600 D) 1200
7. ___________ balls repel moths and other insects. [ ]
A) Benzene B) Napthalene C) Acetone D) None
8. Phosphorus is preserved in [ ]
A) Alcohol B) Benzene C) Kerosene D) None
9. Sudden shaking of earth is called? [ ]
A) Earth quake B) Tsunami C) Lightening D) Thunder storm.
10. Helley’s commet is a commet which appears after every _____ years [ ]
A) 72 B) 74 C) 76 D) 78
Answers
Answer:
1 maas
2liquid and gases
3 picking
4 graphite
5 more ( shayad )
6 650 ( shayad)
7 none (shayad)
8 kerosine (shayad)
9earthquake
10 72years ( shayad)
Answer:
1. C
2. A
3. Blended
4. Graphite.
5. Zero
6. Unable to see question properly.
7. Naphthalene
8. None
9. Earthquake
10. 76 years
Explanation:
1. C ans will be the right one because the mass of an object cannot be changed by force because mass is a property of an object which cannot be changed but the shape or speed or the direction can be changed by force.
2. Fluids are the material which can flow from one place to another.
Since, it is known that in liquids the molecules are held together by less strong intermolecular forces of attraction as compared to solids and in gases, the molecules are held by weak Vander waal forces.
Therefore, the molecules of both liquid and gases can move freely as a result, they are also called fluids.
3. ANY SYNTHETIC FIBRE WHICH COMBINED WITH TWO OR MORE OR OTHER FIBRES IS CALLED AS ( BLENDED FIBRES )
4. Graphite is a non-metal and it is the only non-metal that can conduct electricity.
5.The speed of sound in a vacuum is zero meters per second, as sound cannot travel in a vacuum
6.
7. Mothballs are chemical insecticides that are typically shaped into small balls. Currently, most mothballs are made of paradichlorobenzene, however, they can also be made of naphthalene or camphor
8. Phosphorus is generally stored in Water
9. An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves.
10. Hallley's Comet is a short Period Comet Which is Visible to Earth once in Every 75-76 Years and is the Only Comet Which can be Seen With naked eyes.
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