Answer :
Let's systematically address each part of the problem:
### 1. Substance that does not allow current to pass through
A substance that does not allow current to pass through is called:
- (i) Conductor
- (ii) Semiconductor
- (iii) Insulator
- (iv) Other (que)
Answer: (iii) Insulator
### 2. Atomic number definition
The atomic number is the number of:
- (i) Protons
- (ii) Neutrons
- (iii) Electrons
- (iv) Moles
Answer: (i) Protons
### 3. Fill in the blanks
Let's fill in each blank based on standard scientific knowledge.
- Acceleration due to gravity on the Earth: The standard acceleration due to gravity on Earth, denoted by \( g \), is 9.8 m/s².
- Audible range of the human ear: The human ear can typically hear sounds in the frequency range of 20 Hz to 20,000 Hz (20 kHz).
- Speed of light in vacuum: The speed of light in a vacuum is approximately 299,792 km/s (approx. 300,000 km/s).
- Dimensions of work: Work is defined as force applied over a distance. Its dimensions in terms of base units are [M¹ L² T⁻²].
- Rate of change of velocity: The rate of change of velocity is known as acceleration.
- Substance which reflects light: A substance that reflects light is typically called a mirror or reflective surface.
Thus, the filled blanks will look like this:
1. Acceleration due to gravity on the earth: 9.8 m/s²
2. Audible range of human ear: 20 Hz to 20,000 Hz
3. Speed of light in vacuum: 299,792 km/s
4. Dimensions of work: [M¹ L² T⁻²]
5. Rate of change of Velocity: Acceleration
6. The substance which reflects light is called: Mirror or reflective surface
### 1. Substance that does not allow current to pass through
A substance that does not allow current to pass through is called:
- (i) Conductor
- (ii) Semiconductor
- (iii) Insulator
- (iv) Other (que)
Answer: (iii) Insulator
### 2. Atomic number definition
The atomic number is the number of:
- (i) Protons
- (ii) Neutrons
- (iii) Electrons
- (iv) Moles
Answer: (i) Protons
### 3. Fill in the blanks
Let's fill in each blank based on standard scientific knowledge.
- Acceleration due to gravity on the Earth: The standard acceleration due to gravity on Earth, denoted by \( g \), is 9.8 m/s².
- Audible range of the human ear: The human ear can typically hear sounds in the frequency range of 20 Hz to 20,000 Hz (20 kHz).
- Speed of light in vacuum: The speed of light in a vacuum is approximately 299,792 km/s (approx. 300,000 km/s).
- Dimensions of work: Work is defined as force applied over a distance. Its dimensions in terms of base units are [M¹ L² T⁻²].
- Rate of change of velocity: The rate of change of velocity is known as acceleration.
- Substance which reflects light: A substance that reflects light is typically called a mirror or reflective surface.
Thus, the filled blanks will look like this:
1. Acceleration due to gravity on the earth: 9.8 m/s²
2. Audible range of human ear: 20 Hz to 20,000 Hz
3. Speed of light in vacuum: 299,792 km/s
4. Dimensions of work: [M¹ L² T⁻²]
5. Rate of change of Velocity: Acceleration
6. The substance which reflects light is called: Mirror or reflective surface