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Session 24 : Mock Test 2 for UPSC Prelims 2019
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Sumant Kumar
B.Tech NIT Allahabad. Have written UPSC Mains 2 times with Physics. Channel "Sumant Kumar" on Youtube for Current Affairs Analysis.

U
Thanks Sir ji for such a nice session
believe me sir everyone is doing hindu editorial, please continue this course. we r bored of hindu courses nearly 10 people's r doing this. instead please continue this course. now everyone is running behind ca or hindu editorial.
Sir rajasthan ke liye ek course banaiyye. Exam नजदीक aa rha hai
sir ji, DNA kyu nahi de rahe? hum wait kare ya nahi?
sir plzz DNA kr dooooo
same bcoz wkt p=m*v 10*10=100*1=100
1. A simple machine helps a person in doing: (a) less work (b) the same amount of work with lesser force (c) the same amount of work slowly (d) the same amount of work much faster

2. A simple machine helps a person in doing: (a) less work (b) the same amount of work with lesser force (c) the same amount of work slowly (d) the same amount of work much faster A simple machine is a mechanical device that changes the direction or * simple machine the simplest mechanisms that use mechanical * Thus, simple machine helps us in doing same amount of work with lesser * Examples of simple machines pulley, lever,wheel, screw, etc magnitude of a force advantage to multiply force. force.

3. The tendency of a liquid drop to contract and occupy minimum area is due to: (a) surface tension (b) viscosity (c) density (d) vapour pressure

4. The tendency of a liquid drop to contract and occupy minimum area is due to: (a) surface tension (b) viscosity (c) density (d) vapour pressure Ans (a) Liquid drop tend to contract and appear spherical when it is set free from external forces like gravity, etc. Surface tension is the property among liquids due to which they tend to occupy minimum surface area. OThat's why water droplet appears spherical because for a given volume, a sphere has minimum surface area. O Due to this property of surface tension liquid surface stretches and behaves like a stretched membrane.

5. Which one of the following is a vector quantity? (a) Momentum (b) Pressure (c) Energy (d) Work

6. Which one of the following is a vector quantity? (a) Momentum (b) Pressure (c) Energy (d) Work Ans (a) Scalars are quantities that have magnitude only; they are independent of direction Vectors have both magnitude and direction Momentum is the product of the mass and velocity of an object (p mv) *Momentum is a vector quantity, since it has a direction as well as a magnitude. *The rest of quantities in option pressure, work and energy have magnitude but not direction.

7. For which one of the following is capillarity not the reason? (a) Blotting of ink (b) Rising of underground water (c) Spread a water drop on a cotton cloth (d) Rising of water from the roots of a plant to its foliage

8. For which one of the following is capillarity not the reason? (a) Blotting of ink (b) Rising of underground water (c) Spread a water drop on a cotton cloth (d) Rising of water from the roots of a plant to its foliage Ans (b) Capillary action, or capillarity, is a phenomenon where liquid spontaneously rises in a narrow space such as a thin tube, or in porous materials such as paper or in some non-porous materials such as liquified carbon fibre. This effect can cause liquids to flow against the force of gravity or the magnetic field induction. OIn blotting of ink, spread of water drop on a cotton cloth and the rising of water from the roots of a plant to its foliage

9. When water is heated from 09C to 10 C. Its volume: (a) increases (b) decreases (c) does not change (d) first decreases and then increases

10. When water is heated from 0 C to 10 C. Its volume: (a) increases (b) decreases (c) does not change (d) first decreases and then increases Ans (d) Initially at start of heating from 0 C to 4 C there will be a contraction as a result of which volume decreases. On further heating beyond 4 C to 10 C the molecules gain kinetic energy and start moving more randomly. Thus, intermolecular distance increases as a result of which its volume increases