The nature of velocity-time graph for a car moving with uniform acceleration is always a straight line. The velocity- time graph for a car shows the change in velocity of the moving car over time. For a uniform acceleration, velocity is constant and covers equal distance in equal interval of time.

Hence the correct option is C.

ADDITIONAL INFORMATION

* Acceleration will be constant if the velocity time graph is a straight line with non-zero finite slope, then its displacement versus time graph will be a parabola.

The amplitude is defined as the maximum distance of the wave moving up and down from its mean position during the wave propagation. Distance is a form of length, and meter is the SI unit of amplitude of sound.

Hence the correct option is B.

Current, I= 0.6 A

Time= 10 minutes= 600 seconds

I=

q= == 360 C

Hence the correct option is C.

ADDITIONAL INFORMATION

* Q= electric charge

* I= current

* T= time

A DC generator works on the principle of Faraday’s laws of electromagnetic induction.

A magnetizing force and a static magnetic field are produced around a long straight conductor when a DC current passes through it. Magnetic field is greatly intensified if the wire is coiled and produced a static magnetic field around itself. A voltage and current are induced within the coil due to the movement of wire or variation in magnetic field.

Hence the correct option is C.

ADDITIONAL INFORMATION

* Ohm's law states that the current pass through a conductor is directly proportional to the voltage across it.

* Joule heating converts electric energy into heat energy by the presence of resistance in a circuit and produces heat.

A compass is an instrument which helps in detection of the magnetic field direction. It has a small metal needle which has its own natural magnetism and can magnetized itself and move in all directions. The needle can queue up in the same direction if there is a magnetic field occupancy.

The magnetism of compass disturbs the magnetic field and apply force on the magnetic needle which cause its movement and detects the presence of magnetic field.

Hence the correct option is C.

ADDITIONAL INFORMATION

* Voltmeter is a device used to determine voltage in the circuit.

* Ammeter is a device used to measure the current in the circuit.

* An electric motor operates by using principles of electromagnetism, when an electric current is present in a magnetic field, a strong force is applied on it. This applied force creates a torque on a loop of wire in the magnetic field to spin the motor and perform function.

Solution: An alloy is a homogeneous mixture containing two or more metals in it. Bronze is an alloy made by mixing copper (Cu)and tin (Sn). Hence the correct option is B.

ADDITIONAL INFORMATION: The meaning of the term ‘alloy’ is a substance formed from the combination of two or more metals. Alloys can also be formed from combinations of metals and other elements. An example of an alloy is red gold, which is produced by alloying copper and gold together.

Solution: The number of water molecules present in one formula unit of salt is known as the water of crystallization. Potassium Permanganate (KMnO₄) is an inorganic chemical compound. So because no water molecule is present in this compound it does not possess water of crystallization. Hence the correct option is A.

ADDITIONAL INFORMATION:

Blue vitriol is copper sulphate pentahydrate CuSO4​⋅5H2​O. It has 5 moles of water.
Washing soda is sodium carbonate monohydrate Na2​CO3​⋅H2​O

Mohr's Salt, also referred to as ammonium iron(II) sulfate, is an inorganic compound whose chemical formula is represented as (NH₄)₂Fe(SO₄)₂(H₂O)₆

Solution: Methanoic acid is present in honey bee sting which is used for Chemo communication. Bee sting venom is acidic in nature. it has so many chemicals like histamine(allergy-causing chemical)and hyaluronidase. Hence the correct option is D.

ADDITIONAL INFORMATION:  Baking soda and water paste can be used to neutralize bee venom and decrease discomfort, itching, and swelling. Cover the afflicted region with a thick coating of baking soda paste. Wrap a bandage around the paste. Allow for at least 15 minutes of wear before reapplying as needed.

Solution: Cochlea converts sound waves into electrical impulses. The cochlea receives sound in the form of vibrations and converts that motion into electrical signals. These electrical signals are communicated via neurotransmitters to nerve cells in the brain. Hence, option B is correct.

ADDITIONAL INFORMATION:

The auditory nerve runs from the cochlea to a station in the brainstem (known as nucleus). From that station, neural impulses travel to the brain – specifically the temporal lobe where sound is attached meaning and we HEAR.

It collects sound waves and channels them into the ear canal (external auditory meatus), where the sound is amplified.

Eustachian tubes connect the middle ears to the back of your throat. They help drain fluid and equalize the air pressure inside your ears.

Solution: Nerve cells present in brain and spinal cord function to transmit and receive signals to and from the body. The sodium is needed in the human body to transfer electrical signals by nerve cells. The sodium-potassium pump triggers an electrical impulse that travels from one nerve cell to the next transmitting messages between brain, spinal cord and the rest of the body. Hence, option D is correct.

ADDITIONAL INFORMATION: Nervous system cells are called neurons. They have three distinct parts, including a cell body, axon, and dendrites. These parts help them to send and receive chemical and electrical signals.