A square corner reflector is used in

A square corner reflector is used in which of the following?

A

TV broadcast

B

Point-to-point communication

C

Radio astronomy

D

All of the above

The length of each side of square A is increased by 100 percent to make square B. Again the length of each side of square B is increased by 50 percent to make square C. By what percent is the area of square C greater than the sum of the areas of square A and B?

A

75%

B

80%

C

85%

D

90%

A square hole is punched out of a circular lamina, the diagonal of the square being the radius of the circle. If ‘r’ is the radius of the circle, the C.G. of the remainder from the corner of the square on the circumference will be

A

$$\frac{{{\text{r}}\left( {\pi + 0.25} \right)}}{{\pi - 0.5}}$$

B

$$\frac{{{\text{r}}\left( {\pi - 0.5} \right)}}{{\pi + 0.25}}$$

C

$$\frac{{{\text{r}}\left( {\pi - 0.25} \right)}}{{\pi - 0.5}}$$

D

$$\frac{{{\text{r}}\left( {\pi + 0.25} \right)}}{{\pi + 0.5}}$$

A small square region inside a larger square is shaded. The diagonal of the larger square is three times the diagonal of the small square in length. What fraction of the area of the larger square is not shaded?

A

1/9

B

1/3

C

2/3

D

8/9

The length of each of square A is increased by 100 percent to make square B.Again the length of the each side of square B is increased by 50 peacent to make square C.By of the area df square A and B?

A

75%

B

80%

C

85%

D

90%

The instruction state that Sumi may need 4/9 square yards of one type of material and 2/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 8/18 square yards left that she did not use. What is the total amount of square yards of material Sumi used?

A

1/12

B

1/9

C

2/3

D

10/9

The size of the philips LCD television screen is given as the length of the screen's diagonal , Assume that the screens of the television were flat. Find out how many square inches greater would be the screen of square inches greater would be the screen of a square 21 -inch television set than that of a square 19-inch television set.

A

4

B

16

C

38

D

40

A goat is tied to one corner of a square plot of side 12m by a rope 7m long. Find the area it can graze?

A

19.25 sq.m

B

155 sq.m

C

144 sq.m

D

38.48 sq.m

The safe speed for a train rounding a corner is proportional to the square root of the radius . If the safe speed for a curve of radius 49 meters is 28 km/h. The safe speed for a curve of radius 64 metes is :

A

(256/7)km /h

B

(256/7) km /h

C

32 km /h

D

23 km /h

Reflector in nuclear plants is used to

A

Return the neutrons back into the core

B

Shield the radioactivity completely

C

Check pollution

D

Conserve energy

A square corner reflector is used in

Related Questions