If the rate of change in the area of a circle is π sq. cm/sec, then the rate of change in the radius of the circle when the radius is 10 cm is

1. π cm/sec

2. 0.05cm/sec

3. 0.2πcm/sec

4. 3 cm/sec

View Answer

Correct Answer :

0.05cm/sec

Explanation :
No Explanation available for this question

When a circular oil drop expands on water, its area increases at the uniform rate of 40sq. cm per minute. The rate of increase in the radius when the radius 5 cm is

1. 4/π cm/m

2. 1/200 cm/m

3. 8cm/m

4. 4 cm/ma

View Answer

Correct Answer :

4/π cm/m

Explanation :
No Explanation available for this question

A stone is dropped into a quiet pond and waves move in circles outward from the place where it strikes, at a speed of 30 cm per second. At the instant when the radius of the wave ring is 50mt, the rate of increase in the area of

1. 0.75sq.cm/sec

2. 30sq.cm/sec

3. 30πsq.cm/sec

4. 0.4πsq.cm/sec

View Answer

Correct Answer :

30πsq.cm/sec

Explanation :
No Explanation available for this question

A stone is dropped into a quiet pond and waves move in circles outward from the place where it strikes, at a speed of 30 cm per second. At the instant when the radius of the wave ring is 50 mt, the rate increase in the circumfere

1. 0.6πm/sec

2. 6πm /sec

3. 0.65πm/sec

4. 6 π cm /sec

View Answer

Correct Answer :

0.6πm/sec

Explanation :
No Explanation available for this question

If the rate of change of area of a circle is equal to the rate of change of its diameter then its radius =

1. 2/π

2. 1/π

3. π/2

4. π

View Answer

Correct Answer :

1/π

Explanation :
No Explanation available for this question

The side of a square increases at the rate of 1 cm per second. The rate at which perimeter increases is

1. 2 cm/sec

2. 4cm /sec

3. 5 cm/sec

4. 3 cm/sec

View Answer

Correct Answer :

4cm /sec

Explanation :
No Explanation available for this question

If the rate of change of the side of a square is 0.05 cm/sec, then the rate of change in the area of the square when the side is 10 cm is

1. 0.5sq.cm/sec

2. 1sq.cm/sec

3. 5sq.cm/sec

4. 10sq.cm/sec

View Answer

Correct Answer :

1sq.cm/sec

Explanation :
No Explanation available for this question

The period of cos4 x is

1. π

2. 2π

3. π/2

4. 3π

View Answer

Correct Answer :

Explanation :
No Explanation available for this question

The period of 5 cos 3x+ 3 tan 3x is

1. π

2. 2π/3

3. π/2

4. 2π

View Answer

Correct Answer :

2π/3

Explanation :
No Explanation available for this question

The periodof118 sin 2x- 143 cot 4x is

1. 2πc

2. πc

3. 4πc

4. none

View Answer

Correct Answer :

π^c

Explanation :
No Explanation available for this question

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