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Given y = 7sin4x, what is the amplitude?

Question 2
Which of the following constitute a food-chain?
1. Grass, wheat and mango
2. Grass, goat and human
3. Goat, cow and elephant
4. Grass, fish and goat

We cannot conveniently measure our body temperature using a laboratory thermometer mainly because it does not have a ___.

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer.

As the coil starts to rotate, the current flows through ABCD as shown. The coil is rotating in:

A pulley has 5 pulleys in all and is 90% efficient. If the effort required to lift a load is 1000 N, find the resistance due to the movable parts of machine and friction.

A car accelerates from rest at a constant rate of 3 metre per second square for some time. Then it retards at constant rate of 6 m per second square and comes to rest. If the total time for which it remains in motion is 3 seconds, what is the total distance travelled?

A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet, their respective kinetic energies will be in the ratio of

In a hydraulic machine, the two pistons have an area of cross-section in the ratio 1:5, what force should be applied on the narrow piston to get an output of 50 N on the wider piston?

A boy climbs on to a wall that is 3.4 m high and gains 2250 J of potential energy. What is the mass of the boy? Take g = 9.8 m/Sec2

The distance covered by the body between 30-40 seconds is

A ball is thrown with same velocity on the surface of earth as well as on the moon. Compare the maximum potential energy attained by the ball on the earth and on the moon. [Assume $g_{earth}=10m{s}^{-2}$ and $g_{moon}=2m{s}^{-2}$]

The ratio of the density of a substance to the density of water at 4°C is usually referred as:

Water strikes the blades of a turbine at the rate of $120kg{s}^{-1}$. If the height of the fall is $120m$, calculate the power delivered to the turbine?
(Given $g=10m{s}^{-2}$)

How is One kilowatt hour related to joule

Work done by gravitational force on a man, in lifting a bucket out of the well by rope tied to the bucket is

A source produces $200$ oscillations per $2$ seconds. Its time period is________.

According to the convention, the direction of the flow of electric current is opposite to the direction of the flow of _______.

The velocity-time graph of a particle of mass 50 g moving in a fixed direction. The force on the particle is

A force of 20 N acts on a Wooden block of 25 kg initially at rest. How long does the force take to displace the block through 1 hectameter and what is its velocity then? [3 MARKS]

Which of the following equipment works on a similar principle as human eye?

Sound waves with frequency greater than 20 kHz are called:

Identify the autotrophs from the following:

At what depth the acceleration due to gravity will become 4.9m/s^2?

What happens to cause gravity in the celestial bodies ?

Please the answer without saying about masses ?

An engine can pump 30000L of water to a vertical height of 45 m in 10 minutes. Calculate the work done by the machine and its power.

DEFINE the word momentum?(no use formula)

A block of iron sinks in fluid A but floats in another liquid B, this is because:

An electric iron of resistance $20\Omega$ takes a current of $5A$. Calculate the heat developed in $30s$.

For a uniformly retarded motion, the velocity-time graph is :

(a) a curve

(b) a straight line parallel to the time axis.

(c) a straight line perpendicular to the time axis.

(d) a straight line inclined to the time axis.

If AB is the object and CD is the image formed. If AP is the object distance and CP is the image distance from the mirror. Then choose the correct sign convention?
$\begin{array}{cc}\text{1. height of image}=+ve& \text{2. height of image}=-ve\\ \text{3. height of object}=+ve& \text{4. height of object}=-ve\\ \text{5. AP}=+ve& 6.AP=-ve\\ \text{7. PC}=+ve& 7.PC=+ve\end{array}$

Water is cooled from $4^{\circ }Cto{0}^{\circ }C$. It :

(a) contracts (b) expands

(c) first contracts, then expands

(d) first expands, then contracts.

Why gravitational force is more at poles and less at equator?

A force of 5 N is applied on a body over a surface area of 5 $m^2$. Calculate the pressure applied on the surface.

According to Cartesian sign convention, which of the following is/are true?

State the S.I. unit of energy.

Propagation of sound can be visualised as:

The ion of an element has 3 positive charges. The mass number of the atom is 27 and the number of neutrons is 14. The number of electrons in the ion is ___ .

If a car attains a speed of 36 km per hour from rest in 12 minutes time what is the distance covered

Amita walks on a curved path and takes several turns while walking from home to school. In
order to describe her displacement, one must know ?