Subject :NSO Class : Class 8
The diagram shows a ray PQR travelling through a glass slab. Which option in the table gives the correct name for all three rays?
| P | Q | R | |
| A | Incident ray | Emergent ray | Refracted ray |
| B | Incident ray | Refracted ray | Emergent ray |
| C | Emergent ray | Incident ray | Refracted ray |
| D | Emergent ray | Refracted ray | Incident ray |
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 6
Ans 1:
Class : Class 6
II, III AND IV are correct. There is no option like II, III AND IV so the coorect answer is B which includes II AND IV. Larger particles can be seperated from smaller particles by sieving. There is a error in the question
Ans 3:
Class : Class 6
(ii) and(iii) are correct whereas the answer to (i) is handpicking and the answer for (iv) is winnowing
Ans 6:
Class : Class 6
The answer should be B as it is written in the synopsis that cream is separated from milk by centrifugation.
Ans 9:
Class : Class 7
Neither of the options is correct. Even solution is not explaining it well. Kindly tell the correct answer because I think that III and IV are correct.
Ans 11:
Class : Class 10
dheeraj, it is alking about that the statement is correct.mud and water can be separated by many ways but it is asking nly about statemnt(whether the mentioned thing in "statement are crrect r not
Ans 14:
Class : Class 7
II,III and IV are correct, none of options are correct and in I it should be sieving/handpicking
Ans 16:
Class : Class 6
Mud and water can be separated by loading, sedimentation, decantation, AND filtration.So, answer should be B
Ans 21:
Class : Class 6
the question is wrong all the options are correct. it is given in the synopsis that centrifugation is used to separate cream from milk.
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Subject :NSO Class : Class 6
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 8
The bumpers and door handles of motor cars, taps etc. are coated with silvery layer of chromium because
(i) It does not easily get corroded.
(ii) It forms a hard layer which does not easily get scratched.
(iii) It tarnishes quickly.
(iv) It is cheap.
Which of the following options is correctly identifies true (T) or false (F)?
| (i) | (ii) | (iii) | (iv) | |
| A | F | F | T | T |
| B | T | T | F | F |
| C | F | T | F | T |
| D | T | T | F | T |
it is wrongshould be b
Ans 2:
Class : Class 9
the people of SOF should be wise but they are acting like dummies.. Its like they don't know that CHROMIUM IS AN EXPENSIVE METAL. IF IT WAS CHEAP WHY WOULD ITEMS NEED TO BE ELECTROPLATED!! BECAUSE OF THIS MISTAKE I LOST A MARK AND IN THE 1ST QUESTION TOO BECAUSE OF THEIR HORRIBLE MISTAKES.. I AM VERY ANGRY NOW.. I MEAN LIKE 2 MISTAKES IN 1 TEST?!?!.. REALLY?!?
Ans 6:
Class : Class 8
chromium is not cheapif it is cheap then the whole material can be made of chromium, why do they electroplate it if its cheapoption D is wrong and option B is correct
Ans 7:
Class : Class 9
It means that in place of electroplating the object with some other metal like silver ,it is cheaper to electroplate it with chromium
Ans 11:
Class : Class 8
CHROMIUM IS AN EXPENSIVE METAL SO WHOLE OBJECT COULD NOT BE MADE OF IT. SO CORRECT ANSWER SHOULD BE B.