Test Details

Chap-5

Objective question

Oct 27, 10:00 PM

60 minutes

Oct 27, 11:00 PM

30.0 marks

MCQ

30 questions

Dharmendra prasad

Given your background, you could offer Prasad Master Classes focusing on preparing students for JEE Mains and NEET examinations. Here's how you might structure your classes: Curriculum Design: Comprehensive coverage of Class 11 and 12 Physics syllabus. Emphasis on topics frequently tested in JEE Mains and NEET. Teaching Methodology: Conceptual understanding with real-life examples. Problem-solving techniques and shortcuts. Regular quizzes and mock tests to track progress. Resource Material:

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Question Text

Question 3 :
A line joining places of zero dip is called

Question 5 :
The angles of dip at the poles and the equator respectively are :

Question 6 :
The value of relative magnetic permeability $$(\mu_r$$) for ferromagnetic materials is

Question 8 :
A magnetic needle is kept in a nonuniform magnetic field. It

Question 10 :
The ratio of intensity of magnetisation and magnetising field is called

Question 11 :
Out of dia, para and ferromagnetism, the universal property of all substances is

Question 14 :
The relative permeability of a medium is $$0.075$$. What is the magnetic susceptibility?

Question 18 :
The relation between $$B, H$$ and $$I$$ in S.I units is :

Question 19 :
If the earth does not rotate on its axis, the change in the weight of a body at the equator would be about (Take radius of earth-6400 km)

Question 20 :
A dip circle is taken to a geomagnetic equator. The needle is allowed to move in a vertical plane perpendicular to the magnetic meridian. The needle will stay in

Question 21 :
Materials suitable for permanent magnet, must have which of the following properties?

Question 22 :
The magnetic moment of adipole is____ if $$l$$ is magnetic length and $$m$$ pole strength.

Question 23 :
A dip needle shows an angle of dip $$\theta$$ in a place which is in the magnetic meridian. Now, the dip circle is rotated through an angle $$x$$ in the horizontal plane and then it shows an angle of dip $$\theta_{1}.$$ Value of $$\tan\theta_{1}/\tan{\theta}$$ is :

Question 24 :
The magnetic force required to demagnetise the material is

Question 25 :
Angle of dip at a place is $$60^0$$ and earth's magnetic field is $$8\mu T$$. Its horizontal component $$B_H$$ is :

Question 26 :
At $$45^o$$ to the magnetic meridian , apparent dip is $$30^o$$. Find true dip :

Question 27 :
Alnico is used for making permanent magnets because it has

Question 29 :
The effective length of a magnet is $$31.4\ cm$$ and its pole strength is $$0.8\ Am$$. The magnetic moment, if it is bent in the form of a semicircle is _____ $$Am^{2}$$.

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