A spring balance can be used to measure :
A.Mass of an object B.Force acting on an object
C.Density of an object D.Weight of an object

Options

A. A and B
B. B and C
C. B and D
D. only D

Answer

To solve the question regarding what a spring balance can measure, let's analyze the options step by step.

### Step 1: Understand what a spring balance is
A spring balance is a device that measures the force exerted on it. This force is typically due to the weight of an object placed on it.

### Step 2: Analyze each option
- **Option A: Mass of an object**
- A spring balance does not measure mass directly. Mass is a measure of the amount of matter in an object and is typically measured using a balance scale that compares the mass of an object to known masses.

- **Option B: Force acting on an object**
- While weight is a force, a spring balance specifically measures the weight of an object, not just any force acting on it. Therefore, this option is not entirely correct.

- **Option C: Density of an object**
- Density is defined as mass per unit volume. A spring balance does not measure volume or mass directly, so it cannot measure density.

- **Option D: Weight of an object**
- This is the correct option. A spring balance measures the weight of an object, which is the force due to gravity acting on it.

### Conclusion
The correct answer is **D. Weight of an object**. A spring balance is specifically designed to measure the weight, which is the force exerted by gravity on an object.

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