If the radius of cylinderis halved and height is doubled, then what will be the curved surface area?

If the radius of cylinder is halved and height is doubled , then what will be the curved surface area?

A

Increase by 1

B

The same

C

Double

D

Triple

If th radius of cylinder is halved and height is doubled, then what will be the curved surface area?

A

icrease by 1

B

the same

C

double

D

triple

if the radious of cylinder is halved and height is doubled, then what will be the curved surface area

A

increase by one

B

the same

C

double

D

triple

A simple spring-mass vibrating system has a natural frequency of $${{\text{f}}_{\text{n}}}.$$ If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

A

$$\frac{{{{\text{f}}_{\text{n}}}}}{2}$$

B

$$2{{\text{f}}_{\text{n}}}$$

C

$$4{{\text{f}}_{\text{n}}}$$

D

$$8{{\text{f}}_{\text{n}}}$$

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of

A

1

B

1.74

C

6.1

D

37

In the formula e = hf . if e is doubled and f is halved , what happens to the value of h?

A

h remains tehe same

B

h is doubled

C

h is divided by 4

D

h is multiplied by 4

If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit

A

Doubles

B

Halves

C

Remains constant

D

Cannot be determined without values

If the digit in the unit's place of a two-digit number is halved and the digit in the ten's place is doubled, the number thus obtained is equal to the number obtained by interchanging the digits. Which of the following is definitely true ?

A

Sum of the digits is a two-digit number

B

Digit in the unit's place is half of the digit in the ten's place

C

Digit in the unit's place and the ten's place are equal

D

Digit in the unit's place is twice the digit in the ten's place

The height of a cone is 24 cm and the area of the base is 154 cm2. What is the curved surface area (in cm2) of the cone?

A

484

B

550

C

525

D

515

If the radius of the base of a right circular cylinder is halved, keeping the height same, what is the ratio of the volume of the reduced cylinder to that of the original one ?

A

1 : 2

B

1 : 4

C

1 : 8

D

8 : 1

If the radius of cylinderis halved and height is doubled, then what will be the curved surface area?

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