Nokea
Which type of lens focuses parallel light rays to a single point?
- A. Concave lens
- B. Convex lens
- C. Cylindrical lens
- D. Plano lens
Correct Answer: B
Rationale: A convex lens focuses parallel light rays to a single point by causing them to converge. This lens is thicker in the center than at the edges, which helps in converging the light rays. Convex lenses are commonly used for tasks like magnification and focusing due to their ability to bring distant light rays to a single focal point. Choice A, the concave lens, diverges light rays rather than converging them, making it incorrect. Choice C, the cylindrical lens, is designed to focus light along one axis rather than converging parallel light rays to a single point. Choice D, the plano lens, has no curvatures to bend or focus light rays, so it does not converge parallel light rays.
You may also like to solve these questions
Which of the following is NOT true about fossils?
- A. They can provide evidence for the order of appearance of different species
- B. They can be used to estimate the age of rocks and layers
- C. They can tell us about the behavior of extinct organisms
- D. They are always perfectly preserved
Correct Answer: D
Rationale: A) This statement is true. Fossils can provide evidence for the order of appearance of different species through the study of the fossil record.
B) This statement is true. Fossils can be used to estimate the age of rocks and layers through relative dating methods such as stratigraphy and absolute dating methods like radiometric dating.
C) This statement is true. Fossils can provide information about the behavior of extinct organisms through the study of their preserved remains and traces.
D) This statement is NOT true. Fossils are not always perfectly preserved. In many cases, fossils are incomplete, fragmented, or altered over time due to geological processes. The level of preservation can vary depending on factors such as the type of organism, the environment in which it lived, and the processes involved in fossilization.
What is the scientific term for a broken bone?
- A. Osteoporosis
- B. Fracture
- C. Sprain
- D. Dislocation
Correct Answer: B
Rationale: The scientific term for a broken bone is a fracture. Osteoporosis is a condition characterized by weak and brittle bones, not a broken bone. A sprain involves an injury to a ligament, not a bone. Dislocation occurs when the ends of bones are forced out of their normal positions at a joint, which is different from a fracture.
As a water wave approaches a shallow beach, what happens to its speed, wavelength, and frequency?
- A. Speed increases, wavelength decreases, frequency increases.
- B. Speed decreases, wavelength decreases, frequency remains the same.
- C. Speed increases, wavelength increases, frequency decreases.
- D. Speed, wavelength, and frequency remain the same.
Correct Answer: B
Rationale: As a water wave approaches a shallow beach, the speed of the wave decreases due to the change in medium from deep to shallow water. According to the wave equation (speed = frequency x wavelength), if the speed decreases and the frequency remains the same, the wavelength must also decrease to maintain the equation balanced. This phenomenon occurs due to the wavefronts being slowed down by the shallower water, causing the wavelength to decrease while the frequency remains constant. Choice A is incorrect as the speed of the wave decreases in shallow water. Choice C is incorrect because the speed increases in deep water, not in shallow water. Choice D is incorrect as all the wave characteristics change when moving from deep to shallow water.
Which of the following glands is NOT directly controlled by the pituitary gland?
- A. Thyroid gland
- B. Adrenal glands
- C. Pancreas (Islets of Langerhans)
- D. Parathyroid glands
Correct Answer: C
Rationale: The pituitary gland, known as the master gland, regulates various endocrine glands by releasing specific hormones. The thyroid gland, adrenal glands, and parathyroid glands are directly controlled by the pituitary gland through hormones like thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), and parathyroid hormone (PTH) respectively. However, the pancreas, particularly the Islets of Langerhans, is not directly influenced by the pituitary gland. The pancreas is mainly governed by blood glucose levels and hormones such as insulin and glucagon, which play a crucial role in regulating blood sugar levels and metabolism. Therefore, the correct answer is C. Choice A, the thyroid gland, is controlled by the pituitary gland through TSH. Choice B, the adrenal glands, are regulated by the pituitary gland via ACTH. Choice D, the parathyroid glands, are under the direct control of the pituitary gland through PTH.
What is the muscular tube that transports sperm from the testes to the urethra called?
- A. Epididymis
- B. Vas deferens
- C. Seminal vesicle
- D. Cowper's gland
Correct Answer: B
Rationale: The correct answer is the vas deferens. It is the muscular tube responsible for carrying sperm from the testes to the urethra. After sperm is produced in the testes, it moves to the epididymis for maturation and storage. The seminal vesicle contributes fluid to semen, but it is not the tube that transports sperm. Cowper's gland also adds fluid to semen but is not involved in transporting sperm. Therefore, the vas deferens is the accurate choice for the muscular tube that transports sperm.