Naeem Academy - Test.take

Question 1 :-

The octet rule is not valid for the molecule

a:

CO₂

b:

H₂O

c:

O₂

d:

CO

Question 2 :-

The nature of bonding in CCl4 and CaH2 is:

a:

Electrovalent in both CCl₄ and CaH₂

b:

Covalent in CCl₄ and electrovalent in CaH₂

c:

Electrovalent in CCl₄ and covalent in CaH₂

d:

Covalent in both CCl₄ and CaH₂

Question 3 :-

CCl₄ is insoluble in water because:

a:

CCl₄ is nonpolar and water is polar

b:

Water is nonpolar and CCl4 is polar

c:

Water and CCl4 are both polar

d:

NOT

Question 4 :-

Which is not an exception to octet rule?

a:

BF₃

b:

SnCl₄

c:

BeI₂

d:

ClO₂

Question 5 :-

The compound with the lowest melting point is

a:

AlF₃

b:

AlCl₃

c:

AlBr₃

d:

AlI₃

Question 6 :-

A solid substance is soft, has a low melting point and is a poor conductor of electricity. The substance is most likely.

a:

An ionic solid

b:

Network solid

c:

A metallic solid

d:

A molecular solid

Question 7 :-

By applying a Silver Nitrate solution to pure carbon tetrachloride

a:

A white precipitate soluble in ammonia is obtained

b:

A curdy precipitate insoluble in ammonia is obtained

c:

A pale yellow precipitate is obtained

d:

No precipitate is obtained

Question 8 :-

Why does a rider on horseback fall when the horse starts running all of a sudden?

a:

The rider is suddenly afraid of falling

b:

The lower body of the rider moves forward with the horse but the inertia of rest keep the upper body at rest

c:

The rider is pushed backwards

d:

None of the above options

Question 9 :-

Which of the following statements is true about inertia?

a:

Inertia is the property of a body by virtue of which the body is unable to change by itself the state of rest.

b:

Inertia is the property of a body by virtue of which the body is able to change by itself the state of rest

c:

Inertia is the property of a body by virtue of which the body is unable to change by itself the direction of motion

d:

Inertia is the property of a body by virtue of which the body is unable to change by itself the state of rest and uniform linear motion

Question 10 :-

Why do passengers in a moving train suddenly feel a jerk in the forward direction when the train stops abruptly?

a:

The upper body of passengers continues to be in the state of motion while the lower part of the body which in contact with the seat remains at rest

b:

The back of the seat pushes passengers forward

c:

The inertia of rest stops the train and takes the passengers forward

d:

Nothing can be said due to insufficient data

Question 11 :-

Why does a man getting off a moving bus fall down?

a:

He falls because of his habit of leaning forward

b:

Due to inertia of motion, the upper body continues to be in motion in the forward direction but the feet come to rest as soon as they touch the ground

c:

Due to inertia of rest, the road is left behind and the man reaches forward

d:

Due to all of the reasons stated above

Question 12 :-

The second law of motion gives the measure of which of the following?

a:

Force

b:

Acceleration

c:

Momentum

d:

Angular Momentum

Question 13 :-

A bullet of 5 gms travels with a velocity of 100 m/sec. It penetrates a wooden block up to 6 cm. What is the average force imposed on the block by the bullet?

a:

0

b:

417 N

c:

830 N

d:

830 N

Question 14 :-

What is the velocity of a body of mass 5 gm if a force of 100 dynes acts on the body for 10 seconds?

a:

2000 cm/sec

b:

200 cm/sec

c:

20 cm/sec

d:

2 cm/sec

Question 15 :-

An object will possess uniform motion as long as the:

a:

Resultant force acting on it begins to decrease

b:

Resultant force on acting on it increases continuously

c:

Resultant force is right angles to its rotation

d:

Resultant force acting on it is zero

Question 16 :-

What is the accelerating force on the Diwali rocket if it ejects 0.05 kg of gases per second at a velocity of 400 m/s?

a:

20 N

b:

20 dynes

c:

1000 N

d:

22 dynes

Question 17 :-

A parachutist weighing w strikes the ground with his legs fixed and comes to rest with an upward acceleration of 3 g. What is the force exerted by him during landing?

a:

w

b:

2w

c:

3w

d:

4w

Question 18 :-

A man stands on a weighing machine in the lift. When the lift is stationary his weight is recorded as 40 kg. If the lift accelerates upwards with an acceleration of 2 m/s2 what weight will the machine show?

a:

40 kg

b:

48 kg

c:

42 kg

d:

32 kg

Question 19 :-

A machine gun fires a bullet of mass 40 g with a velocity of 1200 ms-1. The man holding it cam exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most?

a:

One

b:

Two

c:

Three

d:

Four

Question 20 :-

What is the apparent weight of the body travelling upwards with an acceleration of 2 m/s2 and has a mass of 10 kg?

a:

198 N

b:

140 N

c:

118 N

d:

164 N

Everyday Science 30-04-2022