Q: Explain the mechanism of clotting of blood.
A: Blood clotting takes place in three phases:
1. Formation of prothrombin activator (occurs in two ways)
a. Extrinsic pathway: When blood in shed, the damaged wall of blood vessel or extra vascular tissue comes in contact with blood, thromboplastin is released from the tissue
cells. It activates factor VIII. As a result of these cascade reactions, prothrombin activator is formed.
b. Intrinsic pathway: When blood is exposed to collagen of damaged wall of blood vessel, it activates factor XII. After the cascade of reactions prothrombin activator is formed.
2. Activation of prothrombin: Prothrombin activator activates the prothrombin into
thrombin in presence of Ca++ ions.
3. Formation of fibrin threads: Thrombin converts the soluble fibrinogen
into soluble fibrin. Factor XIII stabilises the soluble fibrin into insoluble
fibrin threads. They form a net on the damaged part of blood vessel. In the meshes of fibrin net, blood cells entangle and thus blood clot in formed. Within few minutes after clot is formed, it begins to contract (clot reaction) and thus fluid is expelled out. It is called serum (i.e., plasma without fibrinogen).
January 5, 2014
10th Class Computing 4 and 2 Marks Questions
'Computing' chapter has a weightage of 11 1/2 marks in your public examination. You need to answer 4 questions in Part-A and 5 bits in Part-B from this chapter.
4 Marks Questions
Q: Gopal purchased a radio set for Rs.500 and sold it for Rs.600. Execute a flow-chart
using this data to determine loss or gain and its percentage.
Q: Draw a flow-chart to pick the largest of the three given numbers.
2 Marks Questions
Q: Draw the Block Diagram of a computer.
4 Marks Questions
Q: Gopal purchased a radio set for Rs.500 and sold it for Rs.600. Execute a flow-chart
using this data to determine loss or gain and its percentage.
Q: Draw a flow-chart to pick the largest of the three given numbers.
2 Marks Questions
Q: Draw the Block Diagram of a computer.
10th Maths Computing Important Questions and Bits
Q: What are the characteristics of a computer. (2 marks)
A: A computer can perform only those operations which are identified and conceived by a
human being.
It can execute the operations perfectly with high speed.
It can easily handle the four basic arithmetic operations addition, subtraction, multiplication and division on finite sets of numbers.
It performs various logical operations.
It can read the instructions and store them for subsequent use.
It carries out any number of instructions most obediently.
1 Mark Questions
Q: What are the essential components of a computer?
A: The essential components of a computer are i) Input Unit
ii) Central Processing Unit (C.P.U.) iii) Output Unit.
Q: Define an Algorithm.
A: An Algorithm is a technical term denoting a step-by-step procedure specifying a
sequence of steps resulting in the completion of a job.
Q: State any four languages used in computer.
A: BASIC, FORTRAN, COBAL, PASCAL.
Q: Define a Flow-Chart. (1 Mark)
A: A diagrammatic or pictorial representation of the sequence of steps for solving a problem.
Q: What do you mean by hardware of the computer? (1 Mark)
A: The three major organs - 1) The input 2) the C.P.U and
3) the output together constitutes the hardware part of the computer.
1/2 Mark Questions
1. ...... is the father of computers.
2. Vacuum tubes were used in the ...... generation of computers.
3. Large amount of information is stored in the ....... unit of the computer.
4. All parts of the computer are controlled by....
Answers
1) Charles Babbage 2) first 3) memory 4) control unit
A: A computer can perform only those operations which are identified and conceived by a
human being.
It can execute the operations perfectly with high speed.
It can easily handle the four basic arithmetic operations addition, subtraction, multiplication and division on finite sets of numbers.
It performs various logical operations.
It can read the instructions and store them for subsequent use.
It carries out any number of instructions most obediently.
1 Mark Questions
Q: What are the essential components of a computer?
A: The essential components of a computer are i) Input Unit
ii) Central Processing Unit (C.P.U.) iii) Output Unit.
Q: Define an Algorithm.
A: An Algorithm is a technical term denoting a step-by-step procedure specifying a
sequence of steps resulting in the completion of a job.
Q: State any four languages used in computer.
A: BASIC, FORTRAN, COBAL, PASCAL.
Q: Define a Flow-Chart. (1 Mark)
A: A diagrammatic or pictorial representation of the sequence of steps for solving a problem.
Q: What do you mean by hardware of the computer? (1 Mark)
A: The three major organs - 1) The input 2) the C.P.U and
3) the output together constitutes the hardware part of the computer.
1/2 Mark Questions
1. ...... is the father of computers.
2. Vacuum tubes were used in the ...... generation of computers.
3. Large amount of information is stored in the ....... unit of the computer.
4. All parts of the computer are controlled by....
Answers
1) Charles Babbage 2) first 3) memory 4) control unit
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