BASIC SCIENCE
1. A bar magnet is suspended freely at its centre. The direction of this magnet at the poles of the earth is *
East West direction
North South direction
Vertically upward
Cannot be predicted
2. Which of the following is a homogeneous mixture? *
Soil
Steel
Milk
Smoke
3. The coefficients for balancing reactants and product in the following chemical are *
N₂ + H₂ --> NH₃
(3, 2, 2)
( 2, 2, 2)
(1, 3, 2)
(2, 3, 2)
4. Peristalsis is the wave like movement of *
Oesophagus
Larnyx
Bronchi
Gall bladder
5. Choose the correctly matched pair. *
Priyanka -Tomato
Neelima - Bitter gourd
Jyothika - Pea
Anagha - Brinjal
6. Calorific value of hydrogen *
100 cal/gm
50 cal/gm
200 cal/gm
150 cal/gm
7. When a ray of light passes from one medium to another, then which property of light will not change? *
Intensity
Frequency
Speed
Wave length
8. 1 kilo Hertz = ............... Hertz *
10,000
100
10
1000
9. From the following which one has more conductivity? *
Iron
Zinc
Copper
Aluminium
10. The small magnets present in a magnetic substance *
Permanent Magnets
Electro Magnets
Atomic Magnets
None of these
11. An insect ......... eats up the pests affects vegetables. *
Spiders
Aphids
Ichneumon wasp
Lady Bird Beetle
12. The membrane which covers the cell is known as ............. *
Cell wall
Nuclear membrane
Plasma membrane
None of these
13. All the time of reproduction the yeast cells make ............... *
Oxygen
Hydrogen
Carbon dioxide
Nitrogen
14. Which of the following is viral disease *
Tuberculosis
Tetanus
Typhoid
AIDS
15. The eye disease caused due to the deficiency of Vitamin A is .......... *
Colour blindness
Blind
Catanact
Night Blindness
16. The nucleus of an atom has .......... change *
Zero
Positive
Chargeless
Negative
17. Chemical bond present in Nitrogen molecule *
Single bond
Double bond
Tripple bond
Convalent bond
18. Which metal can cause blood pressure? *
Iron
Sodium
Cholrine
Copper
Option 5
19. The gas which is used in heavy vehicles? *
Petrol
CNG
Diesel
None of these
20. From the following, which is not an ore. *
Bauxite
Haematite
Calamine
Cryolite
Answers
Answer:
A freely suspended magnet rests in the geographic north-south direction.
Earth has two geographic poles, the North Pole and the South Pole. They are the places on Earth's surface that Earth's imaginary spin axis passes through. Our planet also has two magnetic poles, the North Magnetic Pole and the South Magnetic Pole just like a bar magnet. The magnetic poles are near, but not quite in the same places as, the geographic poles. The needle in a compass points towards a magnetic pole. Earth's North Magnetic Pole is actually the south pole of the Earth's geographic poles and vice-versa.
Hence, a freely suspended magnetic needle point in geographic north-south direction. The magnetic compass is the device that uses this principle. A magnetic compass contains a magnetic needle pivoted in a horizontal plane that indicates the direction of magnetic north at points on the earth's surface. It is an instrument that uses a magnetized steel bar to indicate direction relative to the earth's magnetic poles.
Answer:
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