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 jet travelling at a speed of 500 Kmph ejects a projectile at a speed of 1500 Kmph. What is the speed of the projectile as observed by an observer on ground?

1500

The observer will see relative speed of 1500-500=1000 Kmph.

2

A constant retarding force of 50 N is applied on an object weighing 20 Kg and moving with a speed of 15 m/sec. The object will come to stop after how much time?

6

The retarding momentum to be balanced with the momentum of the object. The retarding momentum is F*t or 50*t=20*15; therefore t= 6 sec.

3

Why a paper clip of iron floats on the surface of water?

This is because the surface tension between the surface of paper clip and water which supports the weight

The weight of the pin is very small and It is the surface tension of the water which supports this weight. If the weight is more than the surface tension, than only it may penetrate the water surface.

4

Bernoulli Principle relates to

conservation of energy

Equation of continuity relates to conservation of mass whereas Bernoulli Principle relates to conservation of energy namely pressure, potential energy due to gravity and kinetic. Giving options in this manner creates doubt.

5

Higher specific heat of a substance is an indication that when an amount of heat is supplied

the temperature of the substance will rise slowly

Q=msδT means specific heat and δT is inversely proportional therefore, higher specific heat means less rise in temperature. The specific heat of water is 4186 as compared to 900 and 500 of Al and Carbon.

6

This is an advantage of friction

Rheostat braking

Rheostat braking is when rotational mechanical energy is converted into electrical and wasted across a resistance. It is not related to friction. Don’t forget that here All is a distracter to confuse.

7

Which one is a vector quantity?

Weight

Weight is a vector whereas mass is a scalar. All others are scalar we all know

8

The famous Einstein equation is written wrongly forgetting where to insert speed of light ‘c’ as m=m₀/[√(1-v²). What is the correct equation?

m=m₀/[√(1-v²/c²)

The correct formula can be assessed by balancing the unit which shall be M for both side and that is the reason c will appear in the denominator of v. Now it may be kept in the numerator as in option 1, than the term will become imaginary as the v can never be more than c.

9

When a body is subjected to deformation force, a restoration force is developed in the body which is also called

Stress

Restoring force per unit area is called Stress. Remember strain is unit less, Y is a relation and constant for a body and Newton law is applicable for external actions.

10

A spring of spring constant k and m does simple harmonic motion in a frictional less horizontal plane. The angular velocity ω is given by

√k/m

x(t)=ACos(ωt+ɸ); v(t)= -ωAsin(ωt+ɸ); a(t)= -ω²Acos(ωt+ɸ); a(t)= -ω²Ax(t) orF(t)= m* a(t)= -mω² or -kx(t) were k= -mω² or ω²=k/m

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Answered

Review

Question 1 of 10

1. Question

A jet travelling at a speed of 500 Kmph ejects a projectile at a speed of 1500 Kmph. What is the speed of the projectile as observed by an observer on ground?

Question 2 of 10

2. Question

A constant retarding force of 50 N is applied on an object weighing 20 Kg and moving with a speed of 15 m/sec. The object will come to stop after how much time?

Question 3 of 10

3. Question

Why a paper clip of iron floats on the surface of water?

Question 4 of 10

4. Question

Bernoulli Principle relates to

Question 5 of 10

5. Question

Higher specific heat of a substance is an indication that when an amount of heat is supplied

Question 6 of 10

6. Question

This is an advantage of friction

Question 7 of 10

7. Question

Which one is a vector quantity?

Question 8 of 10

8. Question

The famous Einstein equation is written wrongly forgetting where to insert speed of light ‘c’ as m=m₀/[√(1-v²). What is the correct equation?

Question 9 of 10

9. Question

When a body is subjected to deformation force, a restoration force is developed in the body which is also called

Question 10 of 10

10. Question

A spring of spring constant k and m does simple harmonic motion in a frictional less horizontal plane. The angular velocity ω is given by