When a person moves closer to a plane mirror, the size of his image in the mirror
Subject :NSO Class : Class 6
Post Your Answer
Subject :NSO Class : Class 3
Post Your Answer
Subject :NSO Class : Class 3
Post Your Answer
Subject :NSO Class : Class 6
The ratchet head of a distance measuring instrument as shown in the given figure, turns by nine revolutions. Find the distance between the anvil and the spindle. Also, how many revolutions does the thimble revolve? (Assume that, distance moved by the spindle for every two revolutions is 0.1 mm.)
| Distance between anvil and spindle |
Revolution of thimble |
|
|---|---|---|
| A | 4.50 mm | 4.5 |
| B | 4.50 mm | 9 |
| C | 9.00 mm | 4.5 |
| D | 4.5 mm | 9 |
There is no option for the correct answer which is 9/2 * 0.1mm = 0.45 mm
Post Your Answer
Subject :NSO Class : Class 5
Post Your Answer
Subject :NSO Class : Class 4
Post Your Answer
Subject :NSO Class : Class 7
A few changes are listed in the box.
(i) Burning of a candle
(ii) Burning of LPG in kitchen
(iii) Burning of a kerosene wick stove
(iv) Burning of biogas
(v) Burning of paper
(vi) Burning of fire crackers
(vii) Burning of magnesium ribbon
Now, read the given passage and fill in the blanks by selecting an appropriate option.(ii) Burning of LPG in kitchen
(iii) Burning of a kerosene wick stove
(iv) Burning of biogas
(v) Burning of paper
(vi) Burning of fire crackers
(vii) Burning of magnesium ribbon
All the changes listed in the box are __(p)__ in nature. Changes __(q)__ are pure chemical changes while changes __(r)__ are both physical and chemical changes.
| p | q | r | |
|---|---|---|---|
| A | Endothermic | (ii), (iv) | (i), (iii), (v), (vi), (vii) |
| B | Exothermic | (i), (iii), (v), (vi), (vii) |
(ii), (iv) |
| C | Endothermic | (iii), (v), (vii) | (i), (ii), (iv), (vi) |
| D | Exothermic | (iv), (v), (vi), (vii) | (i), (ii), (iii) |