As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.
Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. .

**Q1.**Water falls from a tap , down the streamline

Solution

Area decreases

Area decreases

**Q2.**A vessel of area of cross-section A has liquid to a height H. There is a hole at the bottom of vessel having area of cross-section a. The time taken to decrease the level from H

_{1}to H

_{2}will be

Solution

A/a √(2/g)[√(H

A/a √(2/g)[√(H

_{1})-√(H_{2})]**Q3.**The total weight of a piece of wood is 6 kg. In the floating state in water its 1/3 part remains inside the water. On this floating solid, what maximum weight is to be put such that the whole of the piece of wood is to be drowned in the water?>

Solution

Given, 6g=V/3×〖10〗

Given, 6g=V/3×〖10〗

^{3}×g …(i) And (6+m)g=V×〖10〗^{3}×g …(ii) Dividing Eq.(ii) by Eq. (ii) by Eq. (i), we get (6+m)/6=3 Or m=18-6=12 kg

**Q4.**A soap bubble in air (two surface) has surface tension 0.03Nm

^{(-1)}. Find the gauge pressure inside a bubble of diameter 30 mm.

Solution

Gauge pressure=4T/R=(4×0.03)/(30/20×〖10〗

Gauge pressure=4T/R=(4×0.03)/(30/20×〖10〗

^{(-3)})=8 Pa**Q5.**A capillary tube of radius R and length L is connected in series with another tube of radius R/2 and lengthL/4. If the pressure difference across the two tubes taken together is p, then the ratio of pressure difference across the first tube to that across the second tube is

Solution

Volume of liquid flowing per second through each of the two tubes in series will be the same. So V=(π p

Volume of liquid flowing per second through each of the two tubes in series will be the same. So V=(π p

_{1}R^{4})/(8 η L)=(πp_{2}(R/2)^{4})/(8η(L/2)) or p_{1}/p_{2}=1/4**Q6.**A body floats in water with one-third of its volume above the surface of water. If it is placed in oil, it floats with half of its volume above the surface of the oil. The specific gravity of the oil is

Solution

Weight of body = weight of water displaced = weight of oil displaced ⇒2/3 Vρ

Weight of body = weight of water displaced = weight of oil displaced ⇒2/3 Vρ

_{w}g=1/2 Vρ_{0}g ⇒ρ_{0}=4/3 ρ_{w}∴ Specific gravity of oil =ρ_{0}/ρ_{w}=4/3**Q7.**The excess pressure inside one soap bubble is three times that inside a second soap bubble, then the ratio of their surface areas is

Solution

Accordingly 4T/r

Accordingly 4T/r

_{1}=3×4T/r_{2}⟹ r_{1}/r_{2}=1/3 Ratio of surface areas A_{1}/A_{2}>(〖4πr〗_{1}^{2})/(〖4πr〗_{2}^{2})=1/9**Q8.**A streamline body with relative density ρ

_{1}falls into air from a height h

_{1}on the surface of a liquid of relative densityρ

_{2}, wherep

_{2}>p

_{1}. The time of immersion of the body into the liquid will be

Solution

If V is the volume of the body, its weight=V ρ_1 g. Velocity gained by body when it falls from a height h_1=√(2gh_1 ) The weight of liquid displaced by the body as body starts immersing into the liquid =V ρ_2 g. The net retarding force on the body when it starts going in the liquid F=V(ρ_2-ρ_1)g ∴ Retarding, a=F/(Vρ

If V is the volume of the body, its weight=V ρ_1 g. Velocity gained by body when it falls from a height h_1=√(2gh_1 ) The weight of liquid displaced by the body as body starts immersing into the liquid =V ρ_2 g. The net retarding force on the body when it starts going in the liquid F=V(ρ_2-ρ_1)g ∴ Retarding, a=F/(Vρ

_{1})=[V(ρ_{2}-ρ_{1})g/(V ρ_{1})] The time of immersion of the body is that time in which the velocity of the body becomes zero. Using the relation v=u+at, we have v=0,u=√(2gh_1 ), a=-V(ρ_{2}-ρ_{1})g/(V ρ_{1})=-((ρ_{2}-ρ_{1})/ρ_{1})g; We have =0=√(2gh_{1})-((ρ_{2}-ρ_{1})/ρ_{1})gt Or t=√((2h_{1})/g)×(ρ_{1}/(ρ_{2}-ρ_{1}))**Q9.**A liquid does not wet the sides of a solid, if the angle of contact is

Solution

The liquid which do not wet the solid have obtuse angle of contact. For mercury and glass, the angle of contact is 135°.

The liquid which do not wet the solid have obtuse angle of contact. For mercury and glass, the angle of contact is 135°.

**Q10.**A log of wood of mass 120 kg floats in water. The weight that can be put on raft to make it just sink, should be (density of wood =600 kg/m

^{3})

Solution

Volume of log of wood V=mass/density=120/600=0.2m

Volume of log of wood V=mass/density=120/600=0.2m

^{3}Let x weight that can be put on the log of wood So weight of the body =(120+x)×10 N Weight of displaced liquid =V_{σg}=0.2×〖10〗^{3}×10 N The body will just sink in liquid if the weight of the body will be equal to the weight of displaced liquid ∴(120+x)×10=0.2×〖10〗^{3}×10 ⇒120+x=200 ∴x=80 kg