JERUSALEM (AP) _ Soldiers killed a Palestinian youth, a 15-year-old died while being questioned, and an Israeli gold dealer was kidnapped on a nighttime business trip to the West Bank, according to army and Arab reports Thursday.

Israel's Supreme Court rejected appeals by four Palestinians of army orders to deport them as leaders of the 20-month-old uprising in the occupied West Bank and Gaza Strip.

Shaul Mishaniya, 47, was the first Israeli abducted since the uprising began Dec. 8, 1987, and officials said the motive might be criminal. Hundreds of soldiers and police were searching for him.

The 15-year-old Palestinian died mysteriously Wednesday while being questioned by soldiers near Jerusalem.

Arab reporters in the Gaza Strip said a 19-year-old was shot down Wednesday night by soldiers in civilian dress driving cars with Gaza license plates. His death was the ninth reported this week in Gaza.

At least 547 Palestinians have been killed by Israeli troops or civilians in the uprising and 97 have been slain by fellow Arabs as alleged collaborators. Thirty-eight Israelis have died.

The army said it detained about 120 Palestinians suspected of security offenses over the last days. Officials said the West Bank arrests are likely to continue.

In the mixed Arab-Jewish Tel Aviv suburb of Jaffa, police detained seven Arabs suspected of passing weapons to Palestinian guerrillas in Gaza, the national news agency Itim said.

In the West Bank, the army imposed curfews on Tulkarem and surrounding villages while helicopters criss-crossed the area and security forces conducted a house-to-house search for Mishaniya.

An Israeli colonel, not identified, said on army radio: ''We go from one house to another, door to door, to the roofs, basements . .. as far as the imagination can go.''

Arabs said Mishaniya was seized after hundreds of masked youths surrounded an Arab-driven taxi he took to Tulkaren on Wednesday night.

Israeli radio quoted his family as saying Mishaniya was having financial troubles and went to Tulkarem to collect debts from Arab gold dealers, but Arab sources said he often went to the West Bank on business at night.

Few Israelis except Jewish settlers venture into the West Bank, where cars driven by Israelis are frequent targets of stones and firebombs.

Yuval Neeman, a legislator from the right-wing Tehiya Party, said on Israel radio all residents of the Palestinian refugee camp at Tulkarem should be deported in retaliation for the kidnapping. That would be nearly 10,000 people.

Deportation of the four men whose appeals were rejected would bring the number expelled in the rebellion to 59. They are Taysir Aruri, a physics professor whose case has been championed by Israeli and foreign scientists; Odeh Yusef Maali and Majed Labadi, both union organizers, and Mohammed Matur, a teacher.

Officials said Nasser Nabil Nasrallah, 15, was dead on arrival at Augusta Victoria Hospital on Wednesday night. A cousin, Hamad Nasrallah, said he died while being questioned by soldiers in Izzariye, the biblical village of Bethany on Jerusalem's outskirts.

Hamad said soldiers stopped them and a soldier questioning his cousin suddenly cried out: ''Your friend is dead 3/8''

''I didn't hear any shots or anything,'' Hamad said. ''I saw two marks, one on his face and one on his arm.''

Military sources said the youth apparently fainted and died while being questioned. The army ordered an autopsy.

The Arab reporters in Gaza said Iyad Omar Abu Kamal, 19, was killed when soldiers in civilian clothes opened fire on masked youths painting anti- Israeli slogans on walls in Gaza City.

An army spokesman, who cannot be identified under military regulations, said the youths ran when soldiers approached. ''They looked suspicious,'' he said. ''That's why they were being arrested.''

He said soldiers shouted warnings and fired in the air, then opened fire when the Palestinians kept running.

Army officials would not say whether the soldiers were disguised. One source said security forces use disguises when trying to capture Palestinian ''shock troops'' who attack Arabs accused of collaborating with Israel.

Dr. Derick Pounder, a Scottish pathologist, said a second autopsy on a Palestinian-American killed Aug. 18 revealed that he died of a bullet wound in the back but provided no clues about who killed him.

The autopsy was requested by the family of 14-year-old Amjad Jebril Tawil, who was born in Denver. Relatives accused soldiers of killing him, but an army statement said its investigation showed soldiers were not involved.

In Washington, the American-Arab Anti-Discrimination Committee said that the State Department promised the family of the youth it would press Israel to complete its investigation of the killing.