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Question 11
Suppose the two photographs, shown in Fig. 1 and Fig. 2, had been taken at an interval of 10 seconds. If a distance of 100 meters is shown by 1 cm in these photographs, calculate the speed of the blue car.

A real and enlarged image can be obtained by using a :

The diagram shows a metal saucepan containing water and placed on a hot plate. After some time, the air at point X also becomes hot.

What are the main ways by which heat travels from the hot plate through the base of the metal saucepan through the water and through the air to point X?

What is the function of the filament in an electric bulb? What is the principle on which working of a bulb is based on? [2 MARKS]

In supermarkets, it is observed that the freezers where frozen foods are kept do not have a lid and yet, the temperature of the freezer remains below 0^oC. How is this possible?

Pick out the correct situation which may lead to an electric shock.

If part of the full moon passes through Earth's umbra, we will see a(n)

Question 10

Fill in the blanks:
(a) The inner surface of a steel spoon acts as a ___ Mirror
(b) The outers surface of a flat steel plate acts as a ___Mirror
(c) The outer shining surface of a round bottom steel bowl acts as a ___Mirror
(d) The inner surface of the reflector of a torch acts as a ___ Mirror.

Question 7

A water tank has four taps fixed at points A, B, C, D as shown in the figure. The water will flow out at the same pressure from taps at

(a) B and C
(b) A and B
(c) C and D
(d) A and C

The voice coil of a speaker has a diameter of 0.025 m, contains 55 turns of wire, and is placed in a 0.10 T magnetic field. The current in the voice coil is 2.0 A. Determine the magnetic force that acts on the coil and the cone.

What is lateral inversion? Explain with the help of an example.

The sound made by toad is produced when air is forced over its vocal chords which is located in___

Which of the following type of objects allow the light to completely pass through them?

If seen from the earth, the sun appears to move along a circle called ________ .

A kid pushes his toy of weight 100 grams along a distance of 5m on the floor of his house by applying a force of magnitude 9 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

With an increase in temperature the density of air ____.

For a mercury barometer, the change in level of mercury in the tube is due to the change in ____.

Respected teacher ,

In the question we have 6m per hour, then why have you taken -6m

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km. Calculate the average speed and average velocity of flight and car. ( For flight, distance and displacement can be taken as equal)

Answer in the given order (in $km/hr$ ):

Find the Average Speed of Flight, Average velocity of Flight, Average speed of car, Average velocity of car respectively.

The size of the image formed by a plane mirror is

Two cars of masses M and 2M travel at the same speed around a banked curve, of radius r, which is covered with ice. If the first car negotiates the curve without slipping, the second car will :

Which of the following should not be done during the solar eclipse?

Define the term current rating of an electric fuse. Name the material used to make electric fuse and also name two safety measure commonly used in electric circuit and appliances.

A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its centre, for x < R , the electric field is directly proportional to

Why is foot not used as the standard unit of length? [2 MARKS]

Why the third pin of a 3 pin plug is longer and thicker?

Given are a few practices associated with ganga river that people do generally. Pick out those that pollute the ganga river.

1) Industries dump there chemical waste in ganga

2) We use river for transportation

3) Washer men use ganga water to wash clothes on the river banks

4) We build turbine on the flowing water of river ganga to generate electricity

5) After cremation ashes of dead bodies and the unburnt bodies are immersed in the ganga river.

6) Use of river water for irrigation.

Why bio gas is also termed as gobar gas?

Question 5

Write any two properties of a magnet.

How are rest and motion related?

About transfer of heat

The letters on the front of an ambulance are written laterally inverted like ​​​​​​​.Give reason.

The vegetation that grows on its own without any interference from human beings is called

Rohit suggested to his father to fix a security mirror which would provide them with a wider view of the surrounding of the shop. Name the type of mirror that Rohit must have suggested to his father and also mention the basic characteristics of the image formed by this type of mirrors?

An object A at 50 degree Celsius is kept in contact with an object B at 20 degree Celsius, in which direction will the heat flow and why

How does heat energy transferred through conduction

Which of the following object exerts more pressure on the floor? (All object have the same mass).

Which of the following statements is/are true with respect to conduction?

Why don't we sink into the Dead sea just the same way as we sink in the normal seawater?

If the radius of a circle is d, then the area is ___.

A load of 4.0 kg is suspended from a ceiling through a steel wire of length 20 m and radius 2.0 mm. It is found that the length of the wire increases by 0.031 mm as equilibrium is achieved. Find Young modulus of steel. Take $g=3.1\pi m{s}^{-2}.$

Which material allows light to pass through it partially?

Holes are made in hanging banners and hoardings. Explain?