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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion(A) : Graphite is slippery and used as a lubricant.

Reason (R) : Graphite has free electrons.

A) Both A and R are true and R is the correct explanation of A.	B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false.	D) A is false but R is true.

Answer & Explanation Answer: B) Both A and R are true but R is NOT the correct explanation of A.

Explanation:

Graphite possesses a layer structure with two successive layers held by weak forces and able to slide over one another. So, graphite is slippery and this property finds its use as a lubricant. In graphite, each carbon atom is linked to three other carbon atoms while one electron in the carbon atom is delocalised. So, graphite has free electrons

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Filed Under: Assertion and Reason

Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A) : a Leaves of plants are green.

Reason (R) : Plants contain chromoplasts, the green pigment.

A) Both A and R are true and R is the correct explanation of A.	B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false.	D) A is false but R is true.

Answer & Explanation Answer: C) A is true but R is false.

Explanation:

Leaves of plants are green because they contain the green pigment, chlorophyll. However, plants contain chromoplasts but they are not green pigments.

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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion(A) : A little gap is left between iron rails.

Reason (R) : Iron expands in summer.

A) Both A and R are true and R is the correct explanation of A.	B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false.	D) A is false but R is true.

Answer & Explanation Answer: A) Both A and R are true and R is the correct explanation of A.

Explanation:

Iron expands in summer. So, gaps are left between rails to allow for expansion.

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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A) : Carbon dioxide turns lime water milky.

Reason (R) : Carbon dioxide sullies the water.

A) Both A and R are true and R is the correct explanation of A.	B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false.	D) A is false but R is true.

Answer & Explanation Answer: C) A is true but R is false.

Explanation:

Carbon dioxide reacts with lime water (calcium hydroxide) to form milky precipitate of calcium carbonate

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Q:

Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion(A) : Bangladesh imports jute from India.

Reason (R) : Bangladesh has most of the jute mills.

A) Both A and R are true and R is the correct explanation of A.	B) Both A and R are true but R is NOT the correct explanation of A.
C) A is true but R is false.	D) Both A and R are false.

Answer & Explanation Answer: D) Both A and R are false.

Explanation:

When Bangladesh was created after partition of India, the areas of jute production went to Bangladesh while the jute mills were left in India. So, India imports raw jute from Bangladesh.

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Q:

By whom will the unallocated memory that is no longer needed will be cleared in java?

A) Java Virtual Machine	B) Garebage collector
C) Both A and B	D) None

Answer & Explanation Answer: B) Garebage collector

Explanation:

The Java programming language provides a system-level thread to track memory allocation.

Garbage collection has the following characteristics:

• Checks for and frees memory no longer needed

• Is done automatically

• Can vary dramatically across JVM implementations

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Filed Under: Java

Q:

Explain how garbage collection deals with circular referrences?

Answer

The .Net runtime knows about all the references between the objects. It can identify all the circular references that are reachable from the root and hence finalize them to free them all at once if and when needed

Workspace

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Subject: .NET

Q:

The SQL statements that take care of security and authorization are

A) DDL	B) DML
C) DCL	D) None

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