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Q). Total surface area of a hemisphere is
A) 2π r2
B) 3π r2
C) 4π r2
D) π r2
Q). If the radius of base of a cylinder is doubled and the height remains unchanged, then its curved surface area is
A) double
B) three times
C) four times
D) no change
Q). If a right-angled triangle is revolved about its hypotenuse, then it will form a
A) Sphere
B) Cube
C) Cone
D) Cylinder
Q). tan 85° tan 65° tan 45° tan 25° tan 5° =
A) 1
B) 0
C) -1
D) None of these
Q). If sin 18° = cos x, then x =?
A) 73°
B) 37°
C) 72°
D) 84°
Q). =
A) sec θ
B) tan θ
C) sin θ
D) cot θ
Q). If ∠A = 60°, then 3sin3A – 4sinA =
A)
Q). If a cos θ + b sin θ = p; a sin θ- b cos θ = q, then which of the following conditions is true?
A) a2 + b2 = p2 + q2
B) a2 + b2 = P2-q2
C) a2-b2 = p2 + q2
D) a2-b2=p2-q2
Q). If tan α = 1/2., tan β = 1/3, then (α+β)=
A) 30°
B) 60°
C) 45°
D) 0°
Q). If the angle of elevation of the sun is 60°, then the ratio of the height of a tree with its shadow is
A) 1 : 1
B) 1 : √3
C) √3 : 1
D) None of these