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Let's solve the questions one by one from the image you've uploaded. These questions seem to focus on the perpendicular relationships in geometric shapes, specifically in pyramids with triangular and quadrilateral bases.

### Câu 1:
**Cho hình chóp S.ABC có đáy ABC là tam giác cân tại A, cạnh bên SA vuông góc với đáy. M là trung điểm BC, J là trung điểm BM. Khẳng định nào sau đây đúng?**

We have a pyramid \(S.ABC\) with an isosceles base \(ABC\) and \(SA\) perpendicular to the base. We also have the points \(M\) and \(J\) as midpoints of segments \(BC\) and \(BM\) respectively. The goal is to determine which line is perpendicular to the plane.

- **Analysis:**
  Since \(SA \perp (ABC)\), the perpendicular relations will likely involve lines containing \(M\) and \(J\) because they lie on lines from the base.

**Answer**: \( BC \perp (SAB) \). 

So, the correct answer is **A**.

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### Câu 2:
**Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật tâm I, cạnh bên SA vuông góc với đáy. Khẳng định nào sau đây đúng?**

We are working with a pyramid \(S.ABCD\) where the base \(ABCD\) is a rectangle with center \(I\), and \(SA\) is perpendicular to the base.

- **Analysis:**
  Since \(SA \perp (ABCD)\), any statement involving perpendicularity to the plane of the base or diagonals of the base should hold.

**Answer**: \( (SCD) \perp (SAD) \). 

So, the correct answer is **A**.

---

### Câu 3:
**Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật tâm I, cạnh bên SA vuông góc với đáy. Điểm cách đều các đỉnh của hình chóp là:**

We are asked to find the point equidistant from all vertices of a rectangular pyramid.

- **Analysis:**
  The point equidistant from all vertices of a rectangular-based pyramid is typically the midpoint of the line joining the apex and the center of the base.

**Answer**: Trung điểm \(SC\). 

So, the correct answer is **C**.

---

### Câu 4:
**Cho hình chóp S.ABC có đáy ABC là tam giác cân tại A, cạnh bên SA vuông góc với đáy, M là trung điểm BC, J là trung điểm BM. Góc giữa 2 mặt phẳng (SBC) và (ABC) là:**

The angle between the two planes is asked here. Since \(SA\) is perpendicular to the base, the angle between these planes will typically involve a line from \(S\) and the base.

**Answer**: Góc \(SBA\).

So, the correct answer is **A**.

---

### Câu 5:
**Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật, cạnh bên SA vuông góc với đáy, H,K lần lượt là hình chiếu của A lên SC, SD. Khẳng định nào sau đây đúng?**

Here, projections of \(A\) on lines \(SC\) and \(SD\) are mentioned. We need to determine which geometric property holds.

**Answer**: \( (SIC) \perp (SCD) \). 

So, the correct answer is **A**.

---

### Câu 6:
**Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật, cạnh bên SA vuông góc với đáy. Khẳng định nào sau đây đúng?**

Once again, we are dealing with perpendicularity between planes.

**Answer**: \( (SBC) \perp (SIA) \). 

So, the correct answer is **A**.

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### Summary of Correct Answers:
1. A
2. A
3. C
4. A
5. A
6. A

Would you like more details on any specific question or explanation?

Here are five related questions:
1. What is the method to find the angle between two planes in a pyramid?
2. How do midpoints affect perpendicular relationships in geometric shapes?
3. Can you explain how projections on different lines are determined?
4. What is the significance of having an apex perpendicular to the base in geometric problems?
5. How can we find the center of mass in a pyramid or cone?

**Tip**: When solving problems involving pyramids, always visualize the base and apex, and consider midpoints and perpendicular projections for a clearer understanding of the geometric relationships.

BÀI TẬP TRẮC NGHIỆM QUAN HỆ VUÔNG GÓC - Various questions on perpendicular relationships in pyramids and geometric shapes.

Solve a set of multiple-choice questions focused on perpendicular relationships in geometric shapes, particularly in pyramids with triangular and rectangular bases. Includes angle calculations between planes and midpoint-related properties.

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