A 0.5 kg ball is thrown up with an initial speed 14 m/s and reaches a maximum height of 8.0m. How much energy is dissipated by air drag acting on the ball during the ascent 

(1) 19.6 Joule

(2) 4.9 Joule

(3) 10 Joule

(4) 9.8 Joule

Subtopic:  Gravitational Potential Energy |
 66%
From NCERT
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An ice cream has a marked value of 700 kcal. How many kilowatt- hour of energy will it deliver to the body as it is digested 

(1) 0.81 kWh

(2) 0.90 kWh

(3) 1.11 kWh

(4) 0.71 kWh

Subtopic:  Power |
 55%
From NCERT
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A running man has half the kinetic energy of that of a boy of half of his mass. The man speeds up by 1m/s so as to have same K.E. as that of the boy. The original speed of the man will be 

(1) 2m/s

(2) (21)m/s

(3) 1(21)m/s

(4) 12m/s 

Subtopic:  Concept of Work |
 56%
From NCERT
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A particle of mass m at rest is acted upon by a force F for a time t. Its Kinetic energy after an interval t is 

(1) F2t2m

(2) F2t22m

(3) F2t23m

(4) Ft2m

Subtopic:  Concept of Work |
 86%
From NCERT
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Two bodies of masses m and 4 m are moving with equal K.E. The ratio of their linear momentums is

(1) 4 : 1

(2) 1 : 1

(3) 1 : 2

(4) 1 : 4

Subtopic:  Concept of Work |
 78%
From NCERT
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A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions with velocities v1 and v2. The ratio of their kinetic energies E1/E2 is 

(1) m1/m2

(2) 1

(3) m1 v2/m2 v1

(4) m2/m1

Subtopic:  Collisions |
 71%
From NCERT
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A bomb of mass 3.0 Kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80 m/s.The total energy imparted to the two fragments is 

(1) 1.07 kJ

(2) 2.14 kJ

(3) 2.4 kJ

(4) 4.8 kJ

Subtopic:  Collisions |
 79%
From NCERT
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A particle of mass m1 is moving with a velocity v1 and another particle of mass m2 is moving with a velocity v2. Both of them have the same momentum but their different kinetic energies are E1 and E2 respectively. If m1 > m2 then 

(1) E1 < E2

(2) E1E2=m1m2

(3) E1 > E2

(4) E1 = E2

Subtopic:  Concept of Work |
 77%
From NCERT
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Four particles are given, having same momentum. Which one has maximum kinetic energy- 

(1) Proton

(2) Electron

(3) Deutron

(4) α-particles

Subtopic:  Concept of Work |
 74%
From NCERT
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An object of mass 3m splits into three equal fragments. Two fragments have velocities vj^ and vi^. The velocity of the third fragment is 

(1) v(j^i^)

(2) v(i^j^)

(3) v(i^+j^)

(4) v(i^+j^)2

Subtopic:  Collisions |
 68%
From NCERT
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