WB JEE 2008 | Laws of Motion Question 1 | Physics

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A shell of mass 10 kg is moving with a velocity of 10 ms^$$-$$1 when it blasts and forms two parts of mass 9 kg and 1 kg respectively. If the 1st mass is stationary, the velocity of the 2nd is

1 m/s

10 m/s

100 m/s

1000 m/s

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

Force required to move a mass of 1 kg at rest on a horizontal rough plane ($$\mu$$ = 0.1 and g = 9.8 m/s²) is

0.98 N

0.49 N

9.8 N

4.9 N

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If the velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of

1000 ms^$$-$$2

100 ms^$$-$$2

10 ms^$$-$$2

1 ms^$$-$$2

WB JEE 2008

MCQ (Single Correct Answer)

-0.25

A bullet emerges from a barrel of length 1.2 m with a speed of 640 ms^$$-$$1. Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is

4 ms

40 ms

400 $$\mu$$s

1 s

WB JEE Subjects