681: A person sitting in a bus experiences a jerk, when the bus stops all of a sudden. This is due to:

(a) Law of inertia

(b) Newton's third law of motion

(c) Einstein's law of relativity

(d) None of these
682: Disguised unemployment generally means

(a) large number of people remain unemployed

(b) alternative employment is not available

(c) marginal productivity of labour is zero

(d) productivity of workers is low
683: What is/are the recent policy initiative(s) of Government of India to promote the growth of manufacturing sector?

1. Setting up of National Investment and Manufacturing Zones

2. Providing the benefit of 'single window clearance'

3. Establishing the Technology Acquisition and Development Fund

Select the correct answer using the codes given below :

(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
684: The given map shows locations of airports labelled as 1, 2, 3, 4 and 5. What is the correct sequence of the airports in which the hijacked Indian Airlines plane IC-814 landed after its initial take off from Kathmandu in December 1999 ?

(a) 3, 1, 2, 4
(b) 2, 4, 1, 3
(c) 5, 4, 2, 3
(d) 5, 1, 3, 2
685: What is the principle by which a cooling system (Radiator) in a motor car works ?

(a) Convection
(b) Conduction only
(c) Both conduction and radiation
(d) Radiation only