Mark âTâ if the statement is true and âFâ if it is false:
$(a)$. To make a battery of two cells, the negative terminal of one cell is
connected to the negative terminal of the other cell. $(T/F)$
$(b)$. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. $(T/F)$
$(c)$. An electromagnet does not attract a piece of iron. $(T/F)$
$(d)$. An electric bell has an electromagnet. $(T/F)$
$(a)$. To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (False)
Explanation
In order to make a battery of two cells, the negative terminal of one cell is connected to the positive terminal of the other cell.
$(b)$. When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (True)
Explanation
A fuse wire is a short-length wire of a low melting point. So if a large current exceeds a safe value (due to short-circuiting or overloading) it heats the fuse wire too much and the wire melts and breaks the circuit.
$(c)$. An electromagnet does not attract a piece of iron. (False)
Explanation
An electromagnet is a temporary magnet that works when the current is passed through it. Therefore, it can attract a piece of iron.
$(d)$. An electric bell has an electromagnet. (True)
Explanation
An electric bell works on the principle of electromagnetism. In an electric bell, a coil of an insulated wire is wrapped around a piece of iron, and when the current passes through the coil it behaves as an electromagnet.
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- State whether the following statements are true or false:(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.(b) A car battery is just one big cell.(c) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and break.(d) A compact fluorescent lamp (CFL) has a filament in it.(e) MCB works on the heating effect of electric current.(f) The heating element of an electric iron is made of tungsten.(g) Compact fluorescent lamp (CFL) works on the heating effect of current.(h) An electromagnet does not attract a piece of iron.(i) An electric bell has an electromagnet.(j) An electromagnet is a temporary magnet.
- Indicate whether the following statements are True (T) or False (F).(a) Unicellular organisms have one-celled body. (T/F)(b) Muscle cells branched. (T/F)(c) The basic living unit of an organism is an organ. (T/F)(d) Amoeba has irregular shape. (T/F)
- Mark (T) If The Statement Is True and (F) If It Is False: (i) Carbon Dioxide Is Released During Photosynthesis. (T/F) (ii) Plants That Synthesize Their Food Are Called Saprotrophs. (T/F)
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- Mark âTâ if the statement is true and âFâ if it is false:$(a)$. We can obtain an enlarged and erect image with a convex mirror. $(T/F)$$(b)$. A concave lens always forms a virtual image. $(T/F)$$(c)$. We can obtain a real, enlarged, and inverted image by a concave mirror. $(T/F)$$(d)$. A real image cannot be obtained on a screen. $(T/F)$$(e)$. A concave mirror always forms a real image. $(T/F)$
- Write T against true and F against false in the following statements.$(a)$. Like charges attract each other (T/F)$(b)$. A charged glass rod attract a charged plastic straw (T/F)$(c)$. Lightning conductor cannot protect a building from lightning (T/F)$(d)$. Earthquakes can be predicted in advance (T/F)
- Mark âTâ if the statement is true and âFâ if it is false:(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)(b) Water shortage is a problem faced only by people living in rural areas. (T/F)(c) Water from rivers is the only source for irrigation in the fields. (T/F)(d) Rain is the ultimate source of water. (T/F)
- In the following statements, tick âTâ against those which are true, and âFâ against those which are false.$(a)$. Sound cannot travel in a vacuum. (T/F)$(b)$. The number of oscillations per second of a vibrating object is called its time period. (T/F)$(c)$. If the amplitude of the vibration is large, the sound is feeble. (T/F)$(d)$. For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)$(e)$. The lower the frequency of vibration, the higher the pitch. (T/F)$(f)$. An unwanted or unpleasant sound is termed music. (T/F)$(g)$. Noise pollution may cause partial hearing impairment. (T/F)
- Mark âTâ if the statement is true and âFâ if it is false:(i) Nitric acid turns red litmus blue. (T/F)(ii) Sodium hydroxide turns blue litmus red. {T/F)(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)(iv) Indicator is a substance which shows different colours in acidic and basic solutions. . (T/F)(v) Tooth decay is caused by the presence of a base. (T/F)
- Tick True/False against the following statements :Fossil fuels can be made in the laboratory. (T/F)CNG is more polluting fuel than petrol. (T/F)Coke is almost pure form of carbon. (T/F)Coal tar is a mixture of various substances. (T/F)Kerosene is not a fossil fuel. (T/F)
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- Find FIRST & FOLLOW for the following Grammar\nE â E + T|T\nT â T â F|F\nF â (E)|id
- Which of the following statements are true (T) and which are false (F)?If all the angles of a quadrilateral are equal, it is a parallelogram.
- Which of the following statements are true (T) and which are false (F)?If the opposite sides of a quadrilateral are equal, it is a parallelogram.
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