Subject :NSO Class : Class 7
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 4:
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 7:
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 10:
Class : Class 8
CHROMIUM IS AN EXPENSIVE METAL SO WHOLE OBJECT COULD NOT BE MADE OF IT. SO CORRECT ANSWER SHOULD BE B.
Ans 11:
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
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Subject :NSO Class : Class 10
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Subject :NSO Class : Class 2
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Subject :NSO Class : Class 9
Ans 2: (Master Answer)
Class : Class 1
The correct answer is B
The gas having lowest boiling point i.e., highly volatile will be distilled out first and the gas having highest boiling point i.e., least volatile will be distilled out at the last. So, the correct order of gases distilling out is neon, nitrogen, oxygen, krypton.
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Subject :NSO Class : Class 3
Ans 6: (Master Answer)
Class : Class 1
The correct answer is B
Here forces X, Y and Z are Friction, Magnetic force and Gravitational force. It is friction which opposes or slows down moving objects
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Subject :NSO Class : Class 2
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