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Consider that the bob of a simple pendulum has moved from its mean position to one of its extreme positions and then again to mean position from where it moved to the other extreme position and then back to the mean position. The bob of the simple pendulum has now completed:

Which of the following are solid object(s)?

The velocity of a car is 18m/s. This velocity is equivalent to ___ km/h.

An electric bulb will glow only when the circuit ______.

Why are lenses used

Shivam is a naughty boy. He wants to trouble his brother by mixing a lot of sugar in his glass of milk. He starts mixing sugar but at one point he realizes that he cannot mix it anymore as the sugar particles settle down at the bottom. This state is known as:

The distance-time graph is an example of ________ graph.

What is the cause of laterral inversion?

If a sample of metal weighs 210 gm in the air, 180 gm in water.

Rohit has an impure copper plate and wants to purify it by electroplating. He can do this by

Emma connected a bulb to an electric circuit, after studying a circuit diagram, but it did not glow. Which of the following cannot be a valid reason for the bulb not glowing?

I am standing in front of a mirror and my left hand is on the right side and my right hand is on the left side. What kind of mirror am I looking at?

Question 1

Which of the following cannot be used for measurement of time?

(a) A leaking tap

(b) Simple pendulum

(c) Shadow of an object during the day

(d) Blinking of eyes

At 9:am the odometer reading was 6573210.0km.At 9:30 am the odometer reads 657320.0km. Calculate the speed of the vehicle in kilometers per hour.

If a simple pendulum oscillates for 40 minutes in 50 seconds ,then what is its time period?

The __________ in ear senses the vibrations of sound, it sends the signals to the brain.

Atmospheric pressure at a place is measured by a ___.

One light year is equal to __________________ .

Reflection of $(0,-12)$ on the y-axes is ___________

The two wires shown in figure are made of the same

material which has a breaking stress of $8{\times }^{8}N{M}^{-2}$. The area of cross section of the upper wire is $0.006c{m}^2$ and that of the lower wire is $0.003c{m}^2$. The mass $m_1=10kg,m_2=20kg$ and the hanger is light. (a) Find the maximum load that can be put on the hanger without breaking a wire. Which wire will break first if the load is increaed ? (b) Repeat the above part if $m_1=10kg$ and $m_2=36kg.$

A simple pendulum takes 20 seconds to complete 12 oscillations. Calculate its time period. What type of motion does the pendulum undergo? [3 MARKS]

In a circuit with one bulb, another bulb is added in series. What happens to the bulbs when current is passed?

The unit of frequency is______.

during a two hour flight for one third of that time the aeroplane flew at a speed of 760 km per hour and for the rest of the time it flew at the speed of 800 km per hour find the distance covered during the flight.

A cube is compressed at $0^{\circ }C$ equally from all sides by an external pressure p. By what amount should the temperature be raised to bring it back to the size it had before the external pressure was applied? (Given K is bulk modulus of elasticity of the material of the cube and $\alpha$ is the coefficient of linear expansion)

If we plot the following data, what kind of graph do we get?

$$\begin{array}{ccccccc}Distancecovered\left(inkms\right)& \text{80}& \text{100}& \text{120}& \text{140}& \text{160}& \text{180}\\ Timetaken\left(inhrs\right)& \text{4}& \text{6}& \text{8}& \text{10}& \text{12}& \text{14}\end{array}$$

1) An elevator ascends at the rate of 5 metre/sec if it starts from the basement which is 5 metre the ground level, in how much time will it reach a height of 50 metre above the ground?

what is zero shadow day

If two people are pulling a box in the same direction with 85 N and 65 N force. Net displacement of the box is 18m. Find the net work done.

In a thermometer, there are $100$ major divisions between the freezing point and the boiling point of water. If each major division has $5$ minor divisions, what is the minimum reading that can be taken using the thermometer?

The Instrument used to measure the mass of an object is called______.

In the above figure, the parallel rays meet/appear to meet ___.

(a) Name and explain any two effects of electric current.

(b) When current flows through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
[5 MARKS]

Can magnets lose their magnetic property? Give reasons for your answer. [5 MARKS]

If an irregular solid covers 12 complete squares and 18 incomplete squares on a centimetre graph paper, then the approximate area of the solid will be

Define Time Period and give its units.

Vijay, who is the forest department head of the North-East region allowed his friend's timber company to cut trees to make more furniture for the growing population of India. What is the negative prospect of Vijay's thinking?

A break in the filament of an electric bulb means________.

Why electric heater have mirrors behind the heating coil?

What are the differences between conductors and insulators? [3 MARKS]

A cylinder of radius R made of a material of thermal conductivity k, is surrounded by a cylindrical shell of inner radius R and outer radius 2R made of a material of thermal conductivity $k_2$. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is

A hot object cools itself by transferring:

The process of transferring a charge from a charged body to the earth is called as ___

Which of the following is correct with respect to speed?

Which of the following option(s) is / are correct with regard to water management?