Multiple Choice Question on Basic Concept of Science Class XI Standard Practice Test 4
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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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Sr No Question Answer Remarks 1 A cricket ball is thrown at a speed of 28 m/sec at an angle of 30 degree. To what height it will go? 10 m h={vSinθ}²/{2*g) and other formulas in this regard are time to reach this distance = vSinθ/g, horizontal distance covered is called range and given by [v² Sing2θ/g] 2 A person is weighing 70 Kg on a weighing scale lying on the floor of a lift. The lift moves downward at an acceleration of 5 m/sec². What will be the reading on the weighing scale? (g=10m/sec²) 35 When the lift is standstill, downward force 70*10 N is balanced by equivalent reaction. When the life moves downward with acceleration of 5*70 N, than the scale will experience a reaction of only 700-350 N equal to 35 Kg. Similarly when the lift is accelerating upward, the scale will read 105 Kg. 3 The relationship curve for converting degree centigrade to Fahrenheit is a inclined straight line The equation for the conversion of degree into Fahrenheit is given by [(Tf-32)/180]=Tc/100 which is straight line with intersection of 32 on Tf scale and slope of 1.8 4 Magnus effect relates to dynamic lift due to spinning The difference in the velocities of air results in the pressure difference between the lower and upper faces and there is net upward force on the object. Ball moving with spin, lift of air plane and aerofoil are explained by this effect. 5 The ratio of volume expansion to linear expansion on heating is around three The linear expansion is only in one direction where volume expansion is in three direction therefore the net effect on volume is three times. The coefficient of linear expansion of Al and Brass is 2.5×10⁻⁵/K and 1.8×10⁻⁵/K whereas volume is 7 and 6×10⁻⁵/K. 6 A body is moving from rest in unidirectional under the influence of constant power. The displacement in time t is proportional to t*√t We know d=ut+½at² and P=M*a*d/t or a=M*t/d and u=0 we get d= ½[M*t/d]t² or d*d proportional to t*t² or t*√t 7 A box is kept in a lorry moving with a constant speed. Suddenly the driver applies brakes. What happens to the box? The box will move in the forward direction of motion if the frictional force is less than braking force. The box was moving in the forward direction along with the lorry. With application of brake, the box will continue to move in the same direction even the brakes are applied but will resisted by the frictional force between box and the lorry surface. If the frictional force is more it will not move and if it is less, than it will slide. On similar argument, answer number 3 and 4 are relevant when the lorry starts accelerating. 8 What is the acceleration experienced by an object lying at the edge of a circular plate and rotating at a constant speed? it will experience acceleration towards the centre of the circular plate The acceleration of an object moving with uniform speed v in a circle of radium R experiences acceleration of magnitude v²/R directed towards centre and is called centripetal acceleration, a term proposed by Newton. 9 When ultimate strength and fracture point on stress-strain curve are close by, the material is called brittle When point 4 and 5 are closer, than the material is brittle 10 Why it is easy to roll a cylinder as compared to rectangular block of same weight and on the surface with same coefficient of friction? There is just one point of contact and no relative motion therefore point does not experience any friction The speed at the point of contact is almost negligible and thus experience very little friction. The static and kinetic friction is zero and the body shall continue to roll with constant velocity but there is rolling friction which will retard the speed. -
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Question 1 of 10
1. Question
A cricket ball is thrown at a speed of 28 m/sec at an angle of 30 degree. To what height it will go?
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Question 2 of 10
2. Question
A person is weighing 70 Kg on a weighing scale lying on the floor of a lift. The lift moves downward at an acceleration of 5 m/sec². What will be the reading on the weighing scale? (g=10m/sec²)
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Question 3 of 10
3. Question
The relationship curve for converting degree centigrade to Fahrenheit is
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Question 4 of 10
4. Question
Magnus effect relates to
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Question 5 of 10
5. Question
The ratio of volume expansion to linear expansion on heating is around
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Question 6 of 10
6. Question
A body is moving from rest in unidirectional under the influence of constant power. The displacement in time t is proportional to
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Question 7 of 10
7. Question
A box is kept in a lorry moving with a constant speed. Suddenly the driver applies brakes. What happens to the box?
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Question 8 of 10
8. Question
What is the acceleration experienced by an object lying at the edge of a circular plate and rotating at a constant speed?
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Question 9 of 10
9. Question
When ultimate strength and fracture point on stress-strain curve are close by, the material is called
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Question 10 of 10
10. Question
Why it is easy to roll a cylinder as compared to rectangular block of same weight and on the surface with same coefficient of friction?
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