Which of the following statements are true?
A. Gravity attracts all objects towards the earth.
B. Magnetic force attracts all kinds of metals.
C. Friction always tries to prevent movement.
D. Lubricants are substances which increase friction.
E. Friction produces heat and causes wear and tear.
F. Friction can help in grinding substances.

(a) A, C, E, F are true.
(b) A, B, C, D are true.
(c) C, D, E, F are true.
(d) A, C, D, F are true.

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Solution

(a) A, C, E and F are true.
Magnetic force does not attract all kinds of metals. It attracts some metals, such as iron and cobalt.
Lubricants are substances that decrease friction.

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Similar questions

Q. Which of the following statements are true?
A. Gravity attracts all objects towards the earth.
B. Magnetic force attracts all kinds of metals.
C. Friction always tries to prevent movement.
D. Lubricants are substances which increase friction.
E. Friction produces heat and causes wear and tear.
F. Friction can help in grinding substances.

(a) A, C, E, F are true.
(b) A, B, C, D are true.
(c) C, D, E, F are true.
(d) A, C, D, F are true.

A man sharpens his knife. Which of these statements describes the properties of friction that are in use?
A. Friction helps to induce magnetism
B. Friction acts in the opposite direction of relative motion.
C. Friction causes the surfaces in contact to wear away.
D. Friction produces heat energy.

Which of the following is/are true about the frictional force?

1. It acts between all moving objects.

2. It always opposes relative motion between two objects.

3. It is a contact force.

4. It is a non- contact force.

Which of the following statements is not true?

(a) Paramagnetic substances are weakly attracted by magnetic field

(b) Ferromagnetic substances cannot be magnetised permanently

(d) Pairing of electrons cancels their magnetic moment in the diamagnetic substances

State True or False :

Magnetic force attracts all kinds of metals.

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(a) A, C, E and F are true.Magnetic force does not attract all kinds of metals. It attracts some metals, such as iron and cobalt.Lubricants are substances that decrease friction.

(a) A, C, E and F are true.
Magnetic force does not attract all kinds of metals. It attracts some metals, such as iron and cobalt.
Lubricants are substances that decrease friction.