Q1. Match List-I with List-II and select the correct answer from the codes given below:
Q2. Match Lis-I with List-II and select the correct answer using the codes given below:
Q3. A liquid drop tends to assume a spherical shape because of
Q4. Consider the following statements. Work is not done, when:
1. a man is walking on a horizontal road
2. a man is climbing up a hill.
3. a man with a load on his head is walking on a horizontal road.
4. moon is revolving round the earth.
Which of the statements given above are correct?
Q5. What is the correct sequence in which the lengths of the following units increase?
Select the correct answer using the codes given below:
Q6. The position– time (x – t) graph for motion of a body is given below:
Which one among the following is depicted by the above graph?
(a) Positive acceleration
(b) Negative acceleration
Q7. A ball is dropped from a satellite revolving around the earth at a height of 120 km. The ball will
(a) continue to move with same speed along a straight line tangentially to the satellite at that time
(b) continue to move with the same speed along the original orbit of satellite
(c) fall down to earth gradually
Q8. Consider the following statements:
1. A light and a heavy body, having equal momenta, have equal kinetic energies.
2. The total energy of a body in motion is equal to the work it can do in being brought to rest.
3. A body cannot have momentum when its energy is zero.
Which of these statement(s) is/are correct?
Q9. A car is moving on a circular path and takes a turn. If R₁ and R₂ be the radius on the inner and outer wheels respectively, then
Q10. Meson was discovered by
S1. Ans (c)
Sol.The unit of acceleration is metre per sect. The unit of electric current is ampere. The unit of work done is joule. The unit of impulse is newton second.
S2. Ans (b)
Sol.Joule denoted by coulomb-volt. Watt denoted by amp^2-ohm. Volt denoted by henery-amp/sec.
Coulomb denoted by farad-volt.
S3. Ans (a)
Sol.The liquid surface always acquires minium surface area due to surface tension so, the small droplet of any liquid is always spherical.
S4. Ans (d)
Sol.Work done is given by, w = F s cos θ
where 0 is the angle between the directions of force applied and displacement.
In cases 1 and 3,
∴ work done = 0
In case 2, w = f s cos 0 = mgh, h being height covered.
In case 4, force is always perpendicular to motion
i.e., θ = 90°, hence w = 0
S6. Ans (c)
Sol.From the given (x – t) graph it is clear that velocity is constant. Therefore, acceleration is zero.
i.e. v = dx/dt = cosnstant
Now acceleration dv/dt=0
S7. Ans (b)
S10. Ans (a)
Sol.Meson are sub-atomic particles composed of a quark and an antiquark. Its existence was theoretically predicted by Jakense physicist-Yukawa Hideki, but it was first discovered by English physicist civil Frank Powell in 1947 in cosmic-ray particle interactions. All meson are unstable having lifetimes ranging from 10-8 to less than 10-22 second.