Multiple Choice Question on Basic Concept of Science Class XI Standard Practice Test 1
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This is a mock drill question bank on Basic Concept of Science of Class XI and XII standard. This is the question bank of 10 questions with 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 bar of steel is having linear coefficient of expansion and young modulus as 1.2×10⁻⁵ /K and 2×10⁷*10⁴ N/m². What stress will develop for 10 degree rise in temperature? 2.4*10⁷ N/m² Strain = 1.2*10⁻⁵*10= 1.2*10⁴ and stress is strain multiplied with young modulus of elasticity- 2.4*10⁷ N/m². Be careful about the unit as its change is generally used as distractor 2 A bob of mass 0.40 Kg hung from the ceiling of a room by a string of 2m long is set into oscillation. The speed of the bob at its mean position is 1 m/s but the string get cut when it is at its extreme position. What is the trajectory of the fall of the bob? Vertical The velocity at the extremities is zero, therefore, the bob will fall vertically down. If the string get cut at the middle, it will move in a parabolic trajectory towards the direction of motion. The numerical values have been given to distract you. Be careful, when the answer does not have numerical values, means no calculations are required. 3 How the blood pressure in human being at feet compares with that in brain? more at feet as compared to brain Generally the height of heart is 1.3 m and that of brain is 1.7 m. The force of gravitation makes the pressure different at brain and foot level. Taking the air density as 1.06×10³ kg/m³, the pressure at foot and brain is 26.8 and 9.3 kPa when pressure at heart is 13.3 kPa (100 mmHg) 4 Which property of water helps for survival of plant and animal life in pond and sea during very low temperature? density of ice is maximum at zero degree than water and it floats on the surface The density of water is maximum at zero degree and less at higher and lower temperature. When frozen, it floats being denser than water and provide thermal protection for the sea life. Option 4 is main distractor with density low but wrongly answered, and if you don’t read the answer carefully, may tick 4 5 It is observed that the free falling body through gas or liquid experience a viscous force which is proportional to velocity, radius of body and viscosity of medium It is observed that the viscous force depends on viscosity eta of the medium, radius of the sphere, velocity and is in the opposite direction to the motion. This is also called Stokes’ Law F=6πηaν. A rain drop falling in air initially accelerates at the level of g but viscous force also increases with increase of v and finally settles at constant velocity and called terminal velocity which remains constant unless viscous force changes in between. You should keep the formular on the rough paper to avoid any influence of distractor. 6 The process of regelation is possible with this substance Ice Regelation is the phenomenon of melting under pressure and freezing again when the pressure is reduced. Many sources state that regelation can be demonstrated by looping a fine wire around a block of ice, with a heavy weight attached to it. Regelation was discovered by Michael Faraday. Regelation occurs only for substances, such as ice, that have the property of expanding upon freezing 7 Angstrom is the smallest measurement unit. What is its value? 10⁻⁷ mm 1 Angstrom is equal to 10⁻⁷mm, unit developed to measure atomic and molecular distances. Distraction is given by unit; suppose you remember the answer in meter, may like to make a mistake. 8 The speed of rotation of an automobile wheel at the point of contact as observed by a stationary person is equal or near to zero The speed at the point of contact is nil or near to zero. If the speed is ωr, than the wheel is slipping and the speed of the top particles of the wheel is 2ωr. (-ωr) is impossible. 9 For what advantage I (eye) crossection is used for Railway track Web resist shear force and bending moment by flange Web resist shear force whereas flange helps in countering the bending moment. Thermal expansion is taken care by providing transition gap at the end of the rail. 10 The ratio of Young and Shear Modulus for the same material is in the range of 2.5 to 3 Shear modulus is small and about one third of young modulus. -
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Question 1 of 10
1. Question
A bar of steel is having linear coefficient of expansion and young modulus as 1.2×10⁻⁵ /K and 2×10⁷*10⁴ N/m². What stress will develop for 10 degree rise in temperature?
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Question 2 of 10
2. Question
A bob of mass 0.40 Kg hung from the ceiling of a room by a string of 2m long is set into oscillation. The speed of the bob at its mean position is 1 m/s but the string get cut when it is at its extreme position. What is the trajectory of the fall of the bob?
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Question 3 of 10
3. Question
How the blood pressure in human being at feet compares with that in brain?
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Question 4 of 10
4. Question
Which property of water helps for survival of plant and animal life in pond and sea during very low temperature?
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Question 5 of 10
5. Question
It is observed that the free falling body through gas or liquid experience a viscous force which is proportional to
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Question 6 of 10
6. Question
The process of regelation is possible with this substance
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Question 7 of 10
7. Question
Angstrom is the smallest measurement unit. What is its value?
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Question 8 of 10
8. Question
The speed of rotation of an automobile wheel at the point of contact as observed by a stationary person is
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Question 9 of 10
9. Question
For what advantage I (eye) crossection is used for Railway track
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Question 10 of 10
10. Question
The ratio of Young and Shear Modulus for the same material is in the range of
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