2151: Assertion (A) : A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level.
Reason (R) : the velocity of sound depends on the temperature of the surrounding medium.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
2152: Which of the following pairs is not correctly matched?
(a) Arjun : Indigenously produced Main Battle Tank (MBT)
(b) Phalcon : Cruise missile supplied by Russia to India
(c) Saras : Indigenously developed civilian passenger aircraft
(d) Operation : New Indian Naval Base at Karwar Seabird
2153: Consider the following statements:
The Mangalyaan launched by ISRO
1. is also called the Mars Orbiter Mission
2. made India the second country to have a spacecraft orbit the Mars after USA
3. made India the only country to be successful in making its spacecraft orbit the Mars in its very first attempt
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
2154: Assertion (A) :
The temperature of a metal wire rises when an electric current is passed through it.
Reason (R):
Collision of metal atoms with each other releases heat energy.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is NOT a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
2155: It BAD is written as YZW and SAME as HZNV, then LOVE will be coded as:
(a) ROWN
(b) OJUC
(c) OLEV
(d) NOPL