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Which of the following is/are the characteristics of a good fuel?

50kJ of energy causes a displacement of 25m in a body in the direction of force in 2.5s. Find the power in a unit of horse power.

The amplitude of a simple harmonic oscillator is doubled then period of oscillator would

A body released from a height falls freely towards earth. Another body is released one sec later. The separation between the bodies two sec after the released of the second body is (ans=24.5 m).

The M.K.S.A system stands for

What determines the pitch of a sound?

A ship on the surface of water sends a signal and receives it back after 4 seconds from a submarine inside the water. Calculate the distance of the submarine from the ship (The speed of sound in water is 1450 m/s).

The magnitude of non-contact forces:

Derive the minimum distance to hear a distinct echo by the obstacle from the source.

Long and thin wires will have ___ resistance compared to short and thick wires.

A body of density $\rho$ sinks in a liquid of density ${\rho }_L$. The densities $\rho$ and ${\rho }_L$ , are related as :
(a) $\rho$ = ${\rho }_L$ (b) $\rho$ < ${\rho }_L$
(c) $\rho$ > ${\rho }_L$ (d) nothing can be said.

Write the derived units of the following :

(a) speed (b) force

(c) work (d) pressure.

The main scale of vernier calipers is calibrated in mm and 19 divisions of the main scale are equal in length to 20 divisions of the vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and the 4th division of the vernier scale coincides with the main scale division. Find :

(i) least count

(ii) radius of the cylinder.

A ball is thrown with an initial velocity of $20\frac{m}{s}$. Find the time of flight and the maximum height reached by the body. $(g=10\frac{m}{s^2}$)

A force of $25N$ acts on an object of mass $2kg$. If its kinetic energy increases from $100J$ to $200J$ then the displacement of the object is____.

How can a body move with both potential and kinetic energy at the same time ? Give some examples . Please explain in easy way .

In summer, if a wooden chair and an iron chair both kept in the sun are touched, which out of both is at will be at the higher temperature?

a gun of mass 3 kg and 5 bullet of mass 30 grams the bullet takes 0.03 seconds to move from gun and have velocity 100 M per second find recoil velocity of gun and force exerted on gun during recoiling

Explain the motion of a rocket with the help of Newton's third law.

The magnetic field strength of a current carrying solenoid increases with

The amplitude of a wave is

The direction of the magnetic field in a straight current-carrying conductor is given by

Interstellar distance is often measured in

A boy tied a string to one of the ends of a box and started sliding the box on a playground. He then observed a circular track and rushed there and completed one revolution of the track with his toy. The work done by friction on the toy is necessarily:

Considering the motion of the object whose velocity-time graph is given in the diagram, calculate the total displacement till 16 seconds?

A body is said to be in static equilibrium when it is

State the importance of green plants in an ecosystem.

The device that breaks a circuit is:

How much work is done by the gravitational force of earth of acting on a satellite moving around it in a circular path ? Give reason for your answer.

Give two examples of bodies having non-uniform motion.

The S.I unit of upthrust is:
(a) Pa (b) N
(c) kg (d) kg $m^2$

Force =?

A body starts from rest with uniform acceleration of 2 $m{s}^{-2}$.Find the distance covered by the body in 2 s.

Question 113

The table shows the lowest recorded temperatures for each continent. Write the continents in order from the lowest recorded temperature to the highest recorded temperature.
$\begin{array}{cc}& \\ \text{The Lowest Recorded Temperatures}& \\ \text{Continent}& \text{Temperature (in Fahrenheit)}\\ \text{Africa}& -{11}^o\\ \text{Antarctica}& -{129}^o\\ \text{Asia}& -{90}^o\\ \text{Australia}& -9^o\\ \text{Europe}& -{67}^o\\ \text{North America}& -{81}^o\\ \text{South America}& -{27}^o\end{array}$

explain why the motion of a body which is moving with constant speed in a circular path is said to be accelerated

The time interval between a lightning flash and the first sound of thunder is 5 s. If the speed of sound in air is 330 m $s^{-1}$, find the distance of flash from the observer.

The correct equation of motion is :

(a) v=u+aS (b) v=ut+a

(c) $S=ut+\frac{1}{2}at$ (d) v=u+at

Derive the relation between g and G.