1. The sex of the children will be determined by what they inherit from the ?

nature

father

mother

mother and father

Answer: father

Explanation:

The sex of the children is determined by what they inherit from their father and not their mother It is because a child who inherits an X chromosome from her father will be a girl and one who inherits a Y chromosome from his father will be a boy


2. A stone is tied to a spring balance. Under which of the following conditions the reading on spring balance will show the least weight ?

When the stone is partially submerged in the water in a beaker

When the stone is completely submerged in the water in a beaker

When the stone is on the surface of water taken in a beaker

When the stone is suspended in air

Answer: When the stone is completely submerged in the water in a beaker

Explanation:


3. Which of the following represents the equation for position-time relation ?

2as = v2 – u2

s = ut + 1/2at2

v = u + at

V = u + at

Answer: s = ut + 1/2at2

Explanation:

s = ut + 1/2at2 shows the relation between position and time


4. If the mass of a solid is doubled, its density ?

becomes two times

becomes half

remains unchanged

becomes four times

Answer: becomes two times

Explanation:

If the mass of a solid body is doubled, its density is doubled. New density becomes, If the mass of a solid body is doubled, its density is doubled


5. Fats and oils become rancid because of ?

transpiration

reduction

oxidation

corrosion

Answer: oxidation

Explanation:

Rancidity is the oxidation of fats and oils that is caused by oxidation, hydration(water), metallic atoms or microbes. Rancidity results in an unusual smell and taste


6. The forces between two bodies are always ?

unequal and in the opposite direction

equal and in the opposite direction

equal and in the same direction

isolated forces

Answer: equal and in the opposite direction

Explanation:

The forces between the two bodies are always equal and in the opposite direction


7. Which of the following statements is true ?

The Mass and weight of a body change from place to place

The Mass of a body remains same while the Weight changes from place to place

The Mass of a body changes from place to place while the Weight remains the same

The Mass and Weight of the body remain the same in different places

Answer: The Mass of a body remains same while the Weight changes from place to place

Explanation:

The weight of the body is actually given by the product of mass with acceleration due to gravity. ... So, we could conclude that, mass of a body doesn't change from place to place but weight does. ? Weight of a body changes from place to place but its mass remains constant


8. If u = o m/s, a = 5 ms-2 and t = 5 s then v = ?

10 ms-1

25 ms-1

10 ms-1

35 ms-1

Answer: 25 ms-1

Explanation:

v = u + at v = 0 + 5*5 v = 25 ms-1


9. The SI unit of electric charge is _______ ?

Wait

Ohm

Amphere

Coulomb

Answer: Coulomb

Explanation:

The SI unit of electric charge is Coulomb (C). Ampere is the SI unit of electric current. Volt is the unit of electric potential difference. Joule is the unit of energy


10. On applying a constant force to a body, it moves with uniform_ ?

Momentum

Speed

Velocity

Acceleration

Answer: Acceleration

Explanation:

When constant force is applied to a body,its acceleration remains constant as force is the product of mass of body and acceleration, F=ma , here mass is constant ,force is constant thus acceleration is uniform