NEET Practice Questions (MCQs) with Answers & Solutions

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A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth and the sixth seconds are equal. The velocity u is given by (g = 9.8 m/s2

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Explanation

The given condition is possible only when body is at its highest position after 5 seconds

It means time of ascent = 5 sec

and time of flight T=2ug=10u=50m/s 

A body, thrown upwards with some velocity reaches the maximum height of 50 m. Another body with double the mass thrown up with double the initial velocity will reach a maximum height of 

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Explanation

Hmaxu2, It body projected with double velocity then maximum height will become four times i.e. 200 m. 

A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 m/s2. He reaches the ground with a speed of 3 m/s. At what height, did he bail out ?

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When a ball is thrown up vertically with velocity V0, it reaches a maximum height of 'h'. If one wishes to triple the maximum height then the ball should be thrown with velocity

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Explanation

Hmaxu2uHmax

i.e. to triple the maximum height, ball should be thrown with velocity 3u

A particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is  

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Explanation

If t1 and 2t2 are the time taken by particle to cover first and second half distance respectively.

t1=x/23=x6 …(i)

x1=4.5t2 and x2=7.5t2

So, x1+x2=x24.5t2+7.5t2=x2

t2=x24 …(ii)

Total time t=t1+2t2=x6+x12=x4 

So, average speed =4m/sec.

The acceleration of a particle is increasing linearly with time t as bt. The particle starts from the origin with an initial velocity v0 The distance travelled by the particle in time t will be 

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Explanation

dvdt=btdv=btdtv=bt22+K1

At t=0,v=v0K1=v0

We get v=12bt2+v0

Again dxdt=12bt2+v0x=12bt23+v0t+K2

At t=0,x=0K2=0

 x=16bt3+v0t 

A car accelerates from rest at a constant rate α for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by the car is 

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Explanation

Let the car accelerate at rate α for time t1 then maximum velocity attained, v=0+αt1=αt1

Now, the car decelerates at a rate β for time (tt1)and finally comes to rest. Then,

0=vβ(tt1)0=αt1βt+βt1

t1=βα+βt

v=αβα+βt  

A stone dropped from a building of height h and it reaches after t seconds on earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t1 and t2 seconds respectively, then 

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Explanation

If a stone is dropped from height h

then h=12gt2 …(i)

If a stone is thrown upward with velocity u then

h=ut1+12gt12 …(ii)

If a stone is thrown downward with velocity u then

h=ut2+12gt22 …(iii)

From (i), (ii) and (iii) we get

ut1+12gt12=12gt2 …(iv)

ut2+12gt22=12gt2 …(v)

Dividing (iv) and (v) we get

ut1ut2=12g(t2t12)12g(t2t22)

or t1t2=t2t12t2t22 

By solving t=t1t2

A ball is projected upwards from a height h above the surface of the earth with velocity v. The time at which the ball strikes the ground is

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Explanation

Since direction of v is opposite to the direction of g and h so from equation of motion

h=vt+12gt2

gt22vt2h=0

t=2v±4v2+8gh2g

t=vg1+1+2ghv2  

A particle is dropped vertically from rest from a height. The time taken by it to fall through successive distances of 1 m each will then be 

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Explanation

h=ut+12gt21=0×t1+12gt12t1=2/g

Velocity after travelling 1m distance

v2=u2+2ghv2=(0)2+2g×1v=2g

For second 1 meter distance

1=2g×t2+12gt22gt22+22gt22=0

t2=22g±8g+8g2g=2±2g

Taking +ve sign t2=(22)/g

t1t2=2/g(22)/g=121 and so on.

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