Subject :NSO Class : Class 10
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Subject :NSO Class : Class 10
Post Your Answer
Subject :NSO Class : Class 10
Ans 1: (Master Answer)
Class : Class 1
The correct answer is D
Current carrying wire produces magnetic field, but direction of magnetic field on the given points X and Y are different.
This is found by right hand thumb rule. So magnetic compasses on X and Yexperience magnetic force of same magnitude but in opposite directions. Hence, the needles will deflect in opposite directions.
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Subject :NSO Class : Class 10
Ans 1: (Master Answer)
Class : Class 1
The correct answer is B
Coil P is moved with a uniform speed towards Q while R is static. Due to the current in P, magnetic field is from right to left. When P is moved towards Q, magnetic lines passing through Q (from right to left) will increase, i.e., magnetic flux passing through Q will increase. Therefore, current will be induced in Q. The induced current will have such a direction that it gives a magnetic field opposite to that passing through Q due to current in P. Thus, anticlockwise current will be induced in coil Q, opposite to the direction of current in coil P.
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Subject :NSO Class : Class 10
Ans 1: (Master Answer)
Class : Class 1
Here, the answer is D.
Black residue is obtained in test tubes I and III i.e., iron gets displaced in test tubes I and III. Therefore, metals P and R should be more reactive than iron.
No change is observed in test tubes II and IV hence, metals Q and S should be less reactive than iron.
Ans 2:
Class : Class 5
Since the residue obtained was black in colour and we know that only Zinc and Copper on reacting with Iron give a black residue hence the answer is Option D
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Subject :NSO Class : Class 10
Ans 2: (Master Answer)
Class : Class 1
Here, the answer is D.
The method used to extract metals from the ore in which they are found depends on their reactivity. For example, reactive metals such as aluminium are extracted by electrolysis, while a less-reactive metal such as iron may be extracted by reduction with carbon or carbon monoxide.
The metals low in the reactive series are very less reactive. The oxides of such metals can be reduced to metals by heating alone e.g. mercury is obtained from its ore, cinnabar (HgS), by the process of heating.
Metals like iron, zinc, lead etc. occur as sulphides or carbonates in nature. First the ore is converted into its oxide form This is done by either roasting or by calcination. The metal oxide is reduced to metal by using suitable reducing agent such as Carbon.
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Subject :NSO Class : Class 10
Ans 1: (Master Answer)
Class : Class 1
Here, the answer is (d).
The right hand rule can be used to determine the direction of the force on a current-carrying wire placed in an external magnetic field.
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Subject :NSO Class : Class 10
Ans 1: (Master Answer)
Class : Class 1
Here, the correct answer is A.
In (A), the incident rays are diverged after refraction, so the lens is concave and in (B), the incident rays are converged after refraction, so the lens is convex.
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Subject :NSO Class : Class 10