Multiple Choice Question on Basic Concept of Science Class XI-XII Standard Practice Test 6
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This is a mock drill question bank on Basic Concept of Science of Class XI and XII standard. The question bank consists of 10 questions with clock set for 10 minutes. After you finish the test, press Quiz Finish and you will get the answer sheet, your result and its comparison with others. You will also be given remarks containing the explanation about the answer and also about the distracters (other options) to build confidence on the subject.
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The Answer Key:
Sr No Question Answer Remarks 1 A metal rod held in hand when rubbed with a silky cloth will accumulate no charge The charge accumulates only on insulators. On conductor the charge conducts through human body to earth. If it is held with wooden handle, the charge will accumulate on the conductor. 2 A silver wire has a resistance of 2.1 Ω at 27.5°C and 2.7 Ω at 100°C. What is the temperature coefficient of resistivity of silver? .0039°C¯¹ R(27.5)=2.1 ohms. R(100)=R(27.5)[1+αΔt]; 2.7=2.1[1+α(72.5)]; α= 0.2857/72; = .0039°C¯¹. Observer that unit has been used as a distractor which sometime missed by many. When change of temperature is in degree, the unit cannot be Kelvin. 3 A current carrying conductor produces magnetic field and the law to calculate the magentic field at a point is given by Biot-Savart Law Biot-Savart law relates the magnetic field to the magnitude, direction, length and proxmity of the electric current. Oersted Law states that The line integral of the magnetic field , around any closed curve C, is proportional to the total current I, passing through any surface bounded by the curve. 4 In a concave mirror the image is formed real and inverted when the object is place further away from the focal point Real and inverted image is formed when the object is placed further away from the focal point. At focal point, the image is formed at infinity and from focal point to the centre, it will be erect and virtual behing the mirror. 5 Melting of ice is a Isothermal Process Since temperature during melting of ice remains constant at 0 degree hence it is isothermal process 6 Two charges of value Q are placed at a distance of r. Another charge of (-Q/3) is required to be placed in between the line joining the two . For equilibrium, where the charge shall be placed? r/2 7 An infinitely long ladder is having a resistance of 1 ohm of each arm of each of the rectangle formed in its consutrction as shown. What is it equivalent resistance? 1+√ 3 Assume the equivalent resistance to be R and as it is infinitely long, than the equivalent resistance will be R when seen from uniform configuration and can be drawn as follows. The resistance now calculated will be option 2. Also notice that the equivalent resistance cannot be more than 3 thus negating option 3 and 4. 8 The image magnification ‘m’ in optics is given by All Every one remembers the formula of first options when v and u are given, but by using the mirror equation of 1/v+1/u=1/f, the relation can be worked out in terms of v &f and u&f. 9 The difference between molar specific heat at constant volume and constant pressure is always negative Cp-Cv=R where R is universal gas constant 10 Multiplication of permittivity and permeability results interesting relation of 1/c² ε₀μ₀=1/c² -
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Question 1 of 10
1. Question
A metal rod held in hand when rubbed with a silky cloth will accumulate
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Question 2 of 10
2. Question
A silver wire has a resistance of 2.1 Ω at 27.5°C and 2.7 Ω at 100°C. What is the temperature coefficient of resistivity of silver?
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Question 3 of 10
3. Question
A current carrying conductor produces magnetic field and the law to calculate the magentic field at a point is given by
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Question 4 of 10
4. Question
In a concave mirror the image is formed real and inverted when the object is place
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Question 5 of 10
5. Question
Melting of ice is a
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Question 6 of 10
6. Question
Two charges of value Q are placed at a distance of r. Another charge of (-Q/3) is required to be placed in between the line joining the two . For equilibrium, where the charge shall be placed?
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Question 7 of 10
7. Question
An infinitely long ladder is having a resistance of 1 ohm of each arm of each of the rectangle formed in its construction as shown. What is it equivalent resistance?
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Question 8 of 10
8. Question
The image magnification ‘m’ in optics is given by
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Question 9 of 10
9. Question
The difference between molar specific heat at constant volume and constant pressure is
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Question 10 of 10
10. Question
Multiplication of permittivity and permeability results interesting relation of
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