DSSSB FSL Scientific Assistant Paper 2013 – Arithmetical and Numerical Ability

DSSSB Delhi Forensic Science Laboratory SA Paper 2013 – Arithmetical and Numerical Ability

If Arithmetic Mean and Harmonic Mean of two numbers are 10 and 6.4 respectively, find their Geometric Mean.
(a) 8
(b) 0.8
(c) 5
(d) 16

The radious of a cone is 7cm and slant height is 10cm. Find the total surface area.
(a) 270sq.cm.
(b) 374sq.cm.
(c) 189sq.cm.
(d) 1890sq.cm.

10degree = ?
(a) 0
(b) 100
(c) 10
(d) 1

Raviraj invested Rs 10,000 at compound interest rate of 10% p.a. for a period of 3 years. How much amount will he get after 3 years?
(a) Rs. 13,210
(b) Rs. 13,320
(c) Rs. 13,310
(d) Rs. 13,130

Three circles with radius 2 cm, 3 cm and 4 cm respectively touch each other externally. If their centres are P,Q and R. Find the perimeter of Triangle PQR.
(a) 18 cm
(b) 9 cm
(c) 24 cm
(d) 20 cm

how many 3 digit numbers can be formed using the numbers 6, 1, 2, 3 without repetition ?
(a) 36
(b) 24
(c) 18
(d) 12

Tenth term of the progression
1/3, 1/7, 1/11, …. is
(a) 1/42
(b) 1/41
(c) 1/39
(d) 1/40

Ratio of two numbers is 3 : 4. Their HCF is 4, then their LCM is
(a) 48
(b) 24
(c) 16
(d) 12

For which sum (Principal) the difference between the compound interest and simple interst for 2 years at 10% is Rs. 200 ?
(a) Rs. 2,000
(b) Rs. 4,000
(c) Rs. 20,000
(d) Rs. 40,000

The polyhedro having the same number of faces and vertices is
(a) Hexahedron
(b) Tetrahedron
(c) Octahedron
(d) None of these