icse class 10

The angle of elevation of the top of a building from a point on the ground, which is 30 m away from the foot of the building, is 30°. The height of the building is:

• 10 m

• 30/√3 m

• √3/10 m

• 30 m

From a point on the ground, which is 15 m away from the foot of the tower, the angle of elevation of the top of the tower is found to be 60°. The height of the tower standing straight is:

• 15√3

• 15

• 30

• 42

Equation of (x+1)2-x2=0 has number of real roots equal to:

• 1

• 2

• 0

• -1

.If the distance between the points A(2, -2) and B(-1, x) is equal to 5, then the value of x is:

• 2

• -2

• 1

• 3

The midpoints of a line segment joining two points A(2, 4) and B(-2, -4)

• (-2,4)

• (2,4)

• (-2,-4)

• (0,0)

In an Arithmetic Progression, if a=28, d=-4, n=7, then an is:

• 3

• 4

• 6

• 8

The 21st term of AP whose first two terms are -3 and 4 is:

• 17

• 137

• -17

• 143

A bag has 3 red balls and 5 green balls. If we take a ball from the bag, then what is the probability of getting red balls only?

• 2/8

• 3/8

• 1/2

• -3/5

. The radius of the top and bottom of a bucket of slant height 35 cm are 25 cm and 8cm. The curved surface of the bucket is:

• 4000

• 3500

• 3630

• 3750

If a cylinder is covered by two hemispheres shaped lid of equal shape, then the total curved surface area of the new object will be

• 4πrh+2πr2

• 4πrh-2πr2

• 2πrh+4πr2

• 2πrh+4πr