Railway Science (Biology – Skeleton System)

Total Questions: 45

11. Which of the following is primarily responsible for the movement of the human body? [RRC Group D 26/09/2022 (Evening)]

Correct Answer: (c) Combination of nervous and muscular tissues
Solution:

The motor neurons release a chemical, which is picked up by the muscle fibre. This tells the muscle fibre to contract, which makes the muscles move. Neurons carry messages from the brain via the spinal cord. These messages are carried to the muscles which tell the muscle fiber to contract, which makes the muscles move.

12. Which of the following statements is correct about striated muscles? [RRC Group D 28/09/2022 (Morning)]

Correct Answer: (b) Prominent light and dark bands are present
Solution:

Striated muscles can contract and relax independently. Function - To generate force and contract in order to support respiration, locomotion, and posture (skeletal muscle) and to pump blood throughout the body (cardiac muscle).

13. During heavy exercise when the demand for energy is high, but the supply of oxygen to produce the energy is limited, the muscle cells show_______. [RRC Group D 11/10/2022 (Morning)]

Correct Answer: (d) formation of lactic acid
Solution:

Due to the need for a lot of energy to conduct strenuous exercises like running, cycling, weightlifting, and so on, which results in a temporary oxygen deficit in the muscle cells. In the absence of oxygen, the cell of the organism undergoes anaerobic respiration, which converts glucose in muscle cells to lactic acid. This also releases energy to a lesser extent.

14. The number of bones in an adult human body is [RRB NTPC CBT - I (09/01/2021) Evening]

Correct Answer: (c) 206
Solution:

Skeletal system divided into axial Skeleton and Appendicular skeleton. Axial skeleton is composed of 80 bones and it consists of skull bone, thoracic cage bone, vertebral column bone. Appendicular skeleton composed of 126 bones and it comprises pelvic girdle, upper limbs, lower limbs, Pectoral girdle. A baby's body has about 300 bones at birth.

15. Which is the longest bone in the human body? [RRB NTPC CBT - I (21/01/2021) Evening]

Correct Answer: (d) Femur
Solution:

The patella, also known as the kneecap, is a flat, rounded triangular bone that articulates with the femur (thigh bone) and covers and protects the anterior articular surface of the knee joint.
The sternum (chest bone) is a flat bone located in the middle of the front of the thorax and is 'T' shaped. The tibia is the main bone of the lower leg, commonly known as the shin.

16. Which part of the human body is formed by the fusing of the ilium, ischium and the pubis? [RRB NTPC CBT - I (22/01/2021) Morning]

Correct Answer: (b) Hip bone
Solution:

Hip joint consists of two bones: the thigh bone (femur) and the pelvis which is made up of three bones called ilium, ischium, and pubis.

17. Which part of the muscular system attaches bone to bone? [RRB NTPC CBT - I (25/01/2021) Morning]

Correct Answer: (d) Ligament
Solution:

Ligament - A band of tissue that connects bones, joints or organs.

18. What is the lubricating fluid found between the two bones at a moveable joint called ? [RRB NTPC CBT - I (27/01/2021) Morning]

Correct Answer: (a) synovial fluid
Solution:

Cerebrospinal fluid (CSF) - It is a clear, colorless, watery fluid that flows in and around our brain and spinal cord. Interstitial fluid - A fluid that fills the spaces between cells. Amniotic fluid - A clear, slightly yellowish liquid that surrounds the unborn baby (fetus) during pregnancy.

19. Approximately, how many bones are there in a child’s body at the time of birth? [RRB NTPC CBT - I (30/01/2021) Evening]

Correct Answer: (b) 300 Bones
Solution:

It eventually fuse (grow together) to form the 206 bones that adults have. A Baby's Bone is mostly made up of cartilage which is a strong, flexible connective tissue that protects joints and bones.

20. Which of the smallest bone of the human body? [RRB NTPC CBT - I (08/03/2021) Morning]

Correct Answer: (d) Stapes
Solution:

Stapes or stirrups (situated in the middle ear of humans and other animals) Humerus (the upper arm bone): The longest bone in the upper limb. Femur (thigh bone) longest bone in the body. Malleus is one of the three bones in the middle ear.