Using Magnets to Find Directions

Q.

Name any two pointing devices.

Q. How do maglev train is made to float above the rails?

Q.

Name a natural magnet.

Q.

Explain the term attractive property of a magnet.

Q.

A compass uses the ……….property of a magnet.

Q. Which of the following is an opaque object?

1. Air
2. Wood
3. Sunglasses
4. Water

Q.

Question 1 (iv)

Fill in the blank in the following.
In olden days, sailors used to find direction by suspending a piece of ___.

Q.

Question 9

How is a compass used to find directions?

Q.

Question 2 (vi)

State whether the following statement is true or false.
A compass can be used to find East-West direction at any place.

Q. We should pivot the compass needle on a sharp pin to _______.

1. To minimise the magnetic effect on the pin
2. To maximise the friction between the pin and the compass needle
3. To minimise the friction between the pin and the compass needle
4. To ensure that the compass needle will not drop from the pivoted point.

Q. What is the cause of hardware disease in cattle?

1. Internal organ failure
2. Harmful pathogens
3. Ingestion of a sharp, metallic object
4. Internal bleeding

Q.

The north pole of a magnet always points towards the ____ when suspended freely.

1. geographic south

2. geographic north

3. geographic east

4. geographic west

Q.

What is used to check the density of acid solution?

Q.

Question 7

A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?

Q. Lodestone' is a naturally occurring magnet. True/False?

Q.

If a traveler using a compass needle follows the direction of the magnetic needle, would he be able to reach the geographic north pole? Explain in detail.

Q. The marked end of a compass needle always points directly to

1. Earth's geographic South Pole
2. Earth's geographic North Pole
3. A magnet's south pole
4. A magnet's north pole

Q. The south seeking end is called _______ pole.

1. South
2. North
3. East
4. West

Q. A straight copper conductor is held parallel to the axis of a freely suspended magnetic needle such that the conductor is under the needle and the current is flowing from south to north. In which direction the north of magnetic needle will move?

Q. A child staying in a coastal region tests the drinking water with his tester. He finds that the compass needle deflects more in the case of sea water.

1. True
2. False

Q. Lodestones were used as the first compasses.

1. True
2. False

Q. Which of the given statements is/are required to explain the resting of a freely suspended magnet in the N-S direction?

Statement I: Earth acts as a giant magnet.
Statement II: Unlike poles of two magnets attract each other.

1. Only statement II
2. Both statements I and II
3. Only statement I
4. Neither statement I nor statement II

Q. A freely suspended magnet aligns in ________ direction.

1. North-East
2. East-West
3. North-South
4. South-West

Q. We should pivot the compass needle on a sharp pin to _______.

1. To maximise the magnetic effect on the pin
2. To minimise the friction between the pin and the compass needle
3. To ensure that the compass needle will not drop from the pivoted point.
4. To minimise the magnetic effect on the pin

Q.

A marine compass is used to

1. compare magnetic moments
2. determine $H$
3. determine direction
4. determine dip at a place

Q.

____________is a device used by navigators to find the direction.

1. None of these

2. Barometer

3. Thermometer

4. Magnetic compass

Q. Rohan has bought some indoor plants which need lots and lots of sunlight. What type of window should he install for his indoor garden?

1. Transparent window
2. Translucent window
3. Any type of window
4. Opaque window

Q. To find the S-pole of a compass is to find the end of the compass needle that

1. Is attracted to an iron
2. Points to the north
3. Attracted by the S-pole of a magnet
4. Repelled by the S-pole of a magnet

Q.

Question 2 (v)

State whether the following statement is true or false.

Bar magnets always point towards North-South direction.

Q. Study the given statements and identify the correct statements.
(i) A magnetic compass is used to show the directions.
(ii) The needle of a magnetic compass is magnetic.
(iii) The needle of a magnetic compass always aligns with the north and the south directions of the earth.

1. Only (ii) and (iii)

2. Only (i) and (iii)

3. All the three

4. Only (i) and (ii)