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Question 24

Two stones are thrown vertically upwards simultaneously with their initial velocities $u_1$ and $u_2$ respectively. Prove that the heights reached by them would be in the ration of $u_1^2$ ; $u_2^2$ ( Assume upward acceleration is –g and downward acceleration to be +g).

Which of the following is not true about gravitational force between two masses?

Floating turbine generators are used in the sea to harness ______

I did not understood the acceleration and its related topics after seeing the main video the summarised video also

Why should we keep thermometer above surface of water while performing activity of latent heat of vaporization?

In the given figure, there are two pistons A and B. The area of the piston A($A_A$) is 50 $c{m}^2$ and area of the piston B($A_B$) is 4000 $c{m}^2$. Find the external input force $F$ required to lift the car of 16000 N.

An astronomical telescope has the objective lens and the eyepiece of focal lengths $80\text{cm}$ and $5\text{cm}$ respectively. Find its magnifying power, if the final image is formed at a distance of $50\text{cm}$ from the eyepiece.

A ball thrown vertically upwards with a speed of $20m{s}^{-1}$ from the top of a tower reaches the earth in $8s$. Find the height of the tower. Take $g=10m{s}^{-2}$

Pressure at a point in a liquid increases if we:

A car starts from rest and accelerates uniformly at the rate of -1m/s¹ for 5sec. It the maintains rhe velocity for 30 s. then the brakes are applied and the car is retarded to rest in 10 s. Find the maximum velocity attained by the car and the total distance travelled by it.

Electric motor converts:

Match the following liquids to their corresponding column heights ($h_1,h_2,h_3$)

in a barometer. ($h_1>h_2>h_3$)

A wire of resistance $2\Omega$ is stretched to double its length such that its volume remains constant. What is the resistance of the stretched wire?

Question 9

What happens to the image distance when we increase the distance of an object from the eye?

The work required to be done to stop an object of 300 kg moving at a velocity of $36km/h$

1. 0

When the resultant force acting on an object is zero, the total momentum of the system will____.

The image of a point object kept on the principal axis of a concave mirror of radius of curvature $R=40cm$ is real, inverted and magnified. If the difference in distance between image and object is 30 cm, as per sign convention the object distance (u) will be:

What is an accelerated motion

Which of the following has the lowest inertia?

The
central idea of the poem ‘The Solitary Reaper’
is__________.

(i)
well sung songs give us happiness

(ii)
melodious sounds appeal to all

(iii)
beautiful experience give us life-long pleasure

(iv)
reapers can sing like birds

In a football match a goal attempt by Messi is stopped by neuer in 0.2 sec . If the mass of the ball is 400gram and the net force applied by neuer is 120N .what was the speed by which Messi hit the ball?

Assertion: Lateral displacement is the distance between extended incident ray and the emergent ray.

Reason: The wider the glass slab, the larger the lateral displacement

A body floats in a liquid:

Everyone knows that heavier objects require more force to move the same distance as lighter objects. Which law can explain this scenario?

A light and a heavy body, both are dropped simultaneously from the same height. Which will strike the ground earlier ?

The area below velocity – time graph gives:

A single horizontal force F is applied to a block of mass $M_1$ which is in contact with another block of mass $M_2$ as shown in the figure. If the surfaces are frictionless, the force between the blocks is

स्पीति अन्य पर्वतीय स्थलों से किस प्रकार भिन्न है?

Air is blown through a pipe $AB$ at a rate of $15\text{litres/min.}$ The cross-sectional area of the broad portion of the pipe $AB$ is $2{\text{cm}}^2$ and that of the narrow portion is $0.5{\text{cm}}^2$. The difference in water level $h$ is (density of air $1.32{\text{kg/m}}^3$)

A body is dropped from a certain height at time $T=0$. It undergoes freefall and reaches the ground at time $T=t$ s. What is the expression for the height $h$ from which the body started its free fall?

Acceleration due to gravity is $g$.

Which statement of Archimedes' principle is true ?

Two objects of masses 2m and 3m respectively move with velocities 2v and v. find the ratio of their momenta.

Q. विदेशी नागरिक द्वारा भारत की नागरिकता प्राप्त करने के संबंध में 1955 के कानून के तहत दिए गए प्रावधान के संदर्भ में, निम्नलिखित कथनों पर विचार कीजिए:

1. वह पंजीयन व देशीयकरण के माध्यम से नागरिकता प्राप्त कर सकता है।

2. व्यक्ति का भारतीय मूल का होना आवश्यक है।

3. पंजीयन करने से पूर्व 12 महीने सम्पूर्ण रूप से भारत में निवास किया हो।

उपर्युक्त कथनों में कौन से कथन सही हैं?

If a body covers equal distances in equal intervals of time, its motion is:

A 2 cm cubical block of mass 2 kg is lying on the ground. What is the pressure exerted by the block on the ground?